Summary

This thing has multiple problems, if done right, redesign is must and necessary.

These parts are just for boxier battery, no need if round type battery is available.
11_fixed_backbot.stl
020_fixed_Battery_Holder.stl

Front hub or something very close to it, beefier and ,more space to actual function correctly.
13_fixed_front.stl

Front nose, more space to mounting screws and for steering slide
32_fixed_front.stl

Wider wheel, if needed.

There are still long way to go...