Holy crap!!! I wake up to find 21 notifications. rofl.
Well that turtle base is similar to a concept that I had for the coilfang race in my campaign. In my campaign the coilfang are going to be on the move alot so i thought it would be cool to have a mobile base. Have it kind of like star craft terran buildings. Where they can get up, move somewhere, and then they could burrow back into the ground. It would also be good for towers. Then towers could also be an offense unit aswell as defense. You could move your towers with your units.