Looks good
But what happens if... Say, you run low on charged batteries and have to push the cart. Isn't it going to be a lot of work to back drive the KOP trannys and
wired CIMs.
You may want to install some kind of mechanical clutch to disengage the motors when you need to push it.
And believe me... There will come a time when you need to push it.
[Edit] Also, how does it turn? [Edit]