Just adding on to the flow of suggestions ^^
Gnome BuilderThe Gnome Builder is part baser, part titan hunter, part supporter. It is focused on upgrading his harvesters and giving them items to improve their combat ability, making them very effective in supporting other basers, defending your own base or killing off titan minions. The idea is that the Gnomes are brilliant inventors, and have constructed Gyrocopters to help defend against the Titan. They can then invent/create more things to boost their allies, themselves or their Gyrocopters in combat, as well as infinitely upgrade their Gyrocopters as long as the resources are available.
Main Builder Stats
OR

Model: Peasant or Gnomish Inventor (custom model:
http://www.hiveworkshop.com/forums/resource.php?t=47735)
Health: 300
Armour: 0, Unarmoured (does it matter unless it's fortified? =/)
Movement Speed: slower than average (say.... 300?)
Building Style: Human
Attack Stats: normal attack stats (125-125, normal, etc).
Harvesting: 10 per swing, 10 max capacity
Abilities:
Invent - allows the gnome to create unique items using combinations of other items, gold and lumber. Spell Book ability.
Has 6 inventory slots.
Main Builder Abilities - InventionsThis is a major part of the Gnome builder, as these inventions assist your teammates or buff your Gyrocopters. I would prefer that the titan can pick these up as well. Most inventions can be built once you meet the costs, but the better ones late game require the Steel Affinity upgrade. All inventions are spells, but do not do anything without the required costs. They all have no cooldown.
Gnomish Rocket Boots
Costs: 1 Flask of Rejuvenation, 1 Staff of Teleportation OR 1000 lumber
Effect: Can be consumed to maximise movespeed for 5 seconds. 1 charge. (a consumable Panic item)
Scale ArmourCosts: 5 gold, 3 Turtle Scales
Effect: Gives +1 armour and +50 health to the holder.
Scalemail ArmourCosts: 10 gold, 2 Scale Armours
Effect: Gives +3 armour and +100 health to the holder.
Requires
Steel AffinityGnomish Spyglass
Costs: 1 Eye of the Ocean
Additional Costs: 5 gold, 1 Eye of the Ocean, 1 Flask of Regeneration
Effect: Increases sight range of the holder (by about 400?).
Additional Effects: May be used to reveal a very small area (about 300 AoE?) anywhere on the map, revealing invisible units within that area. Reveal lasts 3 seconds. 120 second cooldown.
Creating this with additional effects requires
Steel Affinity (and having additional costs met).
Regenerator
Costs: 15 gold, 3 Flasks of Rejuvenation, 1 Armoured Scales
Effects: Grants a 20hp/s regeneration rate to the holder.
Requires
Steel Affinity
Pointy Stick
Costs: 1 Healing Ward
Effect: Increases attack damage of the holder by 5.
Pointy Beast Stick
Costs: 1 Pointy Stick, 1 Scroll of the Beast
Effect: Increases attack damage of the holder by 10.
Pointy Super-Beast Stick
Costs: 5 gold, 1 Pointy Beast Stick, 2 Scrolls of the Beast
Effect: Increases attack damage of the holder by 25.
Requires
Steel AffinitySuper-Pointy Super-Beast
Costs: 5 gold, 1 Pointy Super-Beast Stick, 1 Healing Ward
Effect: Increases attack damage of the holder by 35. Grants a passive aura that heals units in the area by 1% of their max health per second (healing ward aura, does not stack).
Requires
Steel AffinityExplosive BarrelCosts: 10 gold, 1 Healing Ward, 1 Scroll of the Beast, 1 Eye of the Ocean, 1 Flask of Rejuvenation, 1 Teleport Staff
Effect: Lays down a bomb that explodes after 2 seconds, dealing 300 damage to all enemy units in the area. The bomb has 200hp and may be destroyed. 1 charge.
Requires
Steel Affinity
Boomstick
Costs: 5 gold, 1 Healing Ward,1 Scroll of the Beast, 1 Eye of the Ocean, 1 Flask of Rejuvenation
Effects: May be used to fire at an enemy unit up to 1100 range away, dealing 200 damage. 1 charge.
Requires
Steel AffinityUnits
Gyrocopter - 10
lumber, 25
food
Gyrocopters are the heart and soul of the Gnome builder. They start off as simple harvesters (that can fly and attack...) but can be upgraded and enhanced into powerful defenders and hunters. They depend on a fuel system (mana) to operate, and having 0 mana at any time kills the harvester (or maybe just pause, whatever works). They cannot detonate.
Health: 100, no regeneration
Mana: 100 max capacity, 55 initial, -5 mana regeneration
Armour: 1, medium
Movement Speed: 330
Attack Stats: 15-15, Normal, 2s cooldown, 250 range (Flak Cannon attack, not bombs).
Bounty: 4 gold, 4x (regular harvester) experience
Harvesting: Wisp style, 40 per tick, 5 second interval
Abilities:
Hellfire Missile - Fires a single missile that deals 100 damage to the target. 50 mana cost, 30 second cooldown. 700 casting range. Requires
Hellfire Missile Pods.
Gyrocopters have low sight range (err... 600?).
Gyrocopters come with 1 inventory slot.
Gyrocopters are mechanical and can be repaired by the Gnome builder.
StructuresShelter - 10
lumberA basic shelter
Model: Marketplace
Health: 200
Armour: 5, fortified
Units trained:
GyrocopterNotes: no lumber upgrade for the Gnome builder
Factory - 5
lumberFood structure, exactly the same as Goblin's (so I wont list the stats)
Reseach Lab (for lack of better name) - 200
lumberBasic research structure.
Model: Tavern
Health: 200
Armour: 5, fortified
Research Available:
Hellfire Missile Pods, Basic Hull Enforcement, Greater Hull Enforcement, Indestructable Hull Enforcement, Booster Upgrades, Greater Booster Upgrades, Enhanced Tracers, Piercing Tracers, Exceptional Tracers, Greater Fuel Capacity, Maximised Fuel CapacityItems Sold: Turtle Scales
Refueling Tower - 100
lumberThe Gnome's 'tower' that isn't very effective at defending a base, but is required for extending the life of Gyrocopters.
Model: Watch Tower
Health: 150
Armour: 5, medium
Abilities:
Defense Mechanism - Fires missiles to all enemy units within a 700 AoE every second. Each missile deals 25 damage. (based of Phoenix Fire)
Refuel - Restores 1 mana to all units you control in a 500 AoE. 1 second cooldown. (based of Spirit Touch)
Requirements:
ShelterGnomish Factory - 1500
lumberAnother unique building, this structure gives permanent boosts to specific Gyrocopters with abilities that cost gold and lumber. The bonuses can stack on a single Gyrocopter.
Model: War Factory (3x3 pathing)
Health: 200
Armour: 5, fortified
Abilities:
Armour Piercing Rounds - Permanently increases the damage of target Gyrocopter by 5. Requires 1 gold to cast.
Enhanced Gatling Guns - Permanently increases the attack speed of target Gyrocopter by 5%. Requires 1 gold to cast.
Rocket Boosters - Permanently increases the movement speed of target Gyrocopter by 10. Requires 1 gold to cast.
Hull Enforcement - Permanently increases the health of target Gyrocopter by 50. Requires 2 gold to cast.
Fuel Tank Efficiency - Permanently increases the mana capacity of target Gyrocopter by 20. Requires 2 gold to cast.
Requirements:
Research LabNotes: All abilities have 5 second cooldowns.
Gnomish Observatory - 20
gold, 2000
lumberThe Gnome's ARC. Doesnt have many upgrades, but unlocks alot of other upgrades and stuff.
Model: Arcane Sanctum (3x3 pathing)
Health: 300
Armour: 5, fortified
Research Available: Steel Affinity, Cargo Bays, Infantry Survival Training
Requirements:
Research Lab, Gnomish FactoryMerchantSame as every other builder
Iron Wall - 50
lumberA simple tier one wall.
Model: Scout Tower (dark grey)
Health: 250
Armour: 5, fortified.
Upgrades to:
Steel WallSteel Wall - 200
lumber (to upgrade)
Gnome tier two wall, with 5 less armour than other tier two walls but 50 less lumber cost. They can be upgraded to hold items.
Model: Scout Tower (lighter grey)
Health: 500
Armour: 10, fortified
Research AvailableHellfire Missile Pods - 5
gold, 750
lumber.
Unlocks Hellfire Missile for Gyrocopters.
Basic Hull Enforcement - 5
gold, 500
lumber - Tier one Hull Enforcement
Increases the health of Gyrocopters by 150.
Greater Hull Enforcement - 10
gold, 750
lumber - Tier two Hull Enforcement
Further increases the health of Gyrocopters by 150.
Requirements:
Gnomish ObservatoryIndestructable Hull Enforcement - 15
gold, 1000
lumber - Tier three Hull Enforcement
Further increases the health of Gyrocopters by 150.
Requirements: Merchant, Gnomish Observatory
Booster Upgrades - 1
gold, 500
lumber. - Tier one Booster Upgrades.
Increases the movement speed of Gyrocopters by 20.
Greater Booster Upgrades - 5
gold, 1000
lumber. - Tier two Booster Upgrades.
Further increases the movement speed of Gyrocopters by 20.
Enhanced Tracers - 1
gold, 500
lumber - Tier one Tracers
Increases the damage of Gyrocopters by 10 and range by 150.
Piercing Tracers - 5
gold, 750
lumber - Tier two Tracers
Further increases the damage of Gyrocopters by 10 and range by 150.
Requirements:
Gnomish ObservatoryExceptional Tracers - 10
gold, 1500
lumber - Tier three Tracers
Further increases the damage of Gyrocopters by 10 and range by 150.
Requirements:
Merchant, Gnomish ObservatoryGreater Fuel Capacity - 5
gold, 1000
lumber - Tier one Fuel Capacity
Increases the maximum mana capacity of Gyrocopters by 100.
Maximised Fuel Capacity - 15
gold, 1500
lumber - Tier two Fuel Capacity
Further increases the maximum mana capacity of Gyrocopters by 200. (maximum 400 mana capacity)
Requirements:
Gnomish ObservatorySteel Affinity - 10
gold, 1750
lumberUnlocks many item skills for the Gnome builder.
Cargo Bays - 5
gold, 1000
lumber.
Gives the Gnome's walls and Gyrocopters an additional 2 inventory slots.
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Changelog-Changed cost of Scale Armour, removing 2 Armoured Scales for 3 Turtle Scales.
-Increased cost of Scalemail Armour by 5 gold.
-Lowered armor bonus on Scale Armour by 1 and Scalemail Armour by 2.
-Lowered cost of Regenerator by 1 Flask of Rejuvenation.