Added an early version (conversion from tech) in first post.
Gave it a test play today. You have some interesting unit ideas, and some good particles.
-I think your airship design is weak compared to the other units. The balloon is to small to support its weight, and I think cannons would look better housed inside the hull or a turret rather than a free standing gun. Also overall there should be more details, windows, randomly placed armor plates, propellers, flags, rope etc.
-Tanks look good by themselves, but are far to tiny compared to infantry, dino's, or even the bike unit. I know its hard to scale units properly and have them function in the game but the design is very sleek, perhaps bulking tank up more may look better. Also other units have some nice decals maybe the tank could have painted decorations as well.
-PS Tank cannot shoot air units, but really appears to me that it should, having a minigun.
-Structures are your weakest designs. Very low poly and all share similar textures. Being so large on screen generally means you want to show more decals, to nost waste space. Add some gears, pipes, mechanical devices, and other appendages to really make the building look fantastic.
Still a nice start, Wish you the best of luck!