Roy I don't have any plans or parts list. It's made from several different things I cobbled togeather. I just played around with design until I had it the way I wanted. I have a dolly type I built that works great for stationary type keeping, but its not motorized. I used it for a long time before having the electric machine.
Roy sorry to hear about your back. Back problems suck. Have a hitch in mine now and then. Maybe go to 8 frame boxes or even 5 frames? Staying in the game is the goal...