you're one to talk, mr. "hoovercraft"
Two motors and four batts.. that's a lot of power! Guess you won't be charging that with the regular controller since it's 4.8v. There is a 4-cell batt pack in the Epoch Racer shop that Tiny could probably give you a good deal on, but you might prefer single cells so you can spread the weight out evenly. Or maybe you are only using some of those but wanted some spare parts to experiment with.
I think this is a cooler project than the bit plane! Post more pics whenever you get something else done.