This is the second iteration of the design. As I described in the previous post, I added a PVC pipe around the steering column. The bottom of the pipe is screwed into the front of the cart. The motor mount is screwed into the PVC pipe and stabilized with two hose clamps.
After about a week of engineering, the steering mechanism finally works! Now we can steer the vehicle electronically. A giant step for this project!
(I apologize for the bad video quality)