pic: Everything in the tube drive (too late to turn back now)

[Bryce2471]

Originally Posted by chrisfl

Would you be able to put your front and back wheels inside the rails as well? That would utilize more space in them and maybe make the concept more valuable with as much space as possible being utilized

Great idea! I'm surprised I hadn't thought of that. I still don't think the design would have enough value to be worth pursuing, but putting the wheels in there definitely saves some space.
Here's the updated model:Picture