[Arefin Bari]

I think everyone else have covered most of the things about that base. The first thing that caught my eye was the 1x1 that is holding the powered module up. What is the thickness on that? Also... what is the thickness of the shaft that is coming out (going into that 1x1) to connect to the sprocket (in order to turn)? I am assuming its 1/2". Are you worried about that 1x1 bending/sheering? How much does it weigh as is in the picture?

Very interesting concept. I hope after some modifications on the drawing you will be able to manufacture this and share the outcomes. Good luck.