first of al, I really like your work!
As I wanted to build my own truck with an similar idea (using cheap components for gears and so on) I came to find your RC Design. And I really like so I decided to throw my own plans away and reuse yours.
While building up my own car (not my own in 1:1) I wanted to use the short Axle with some Crawler tires. And of course I start in design before printing ;) .While I used your parts to set up the arrangement in the CAD System, I came out to find some clearance problems. First of all the clearance between the SBlock_Type B and the rims of an typical crawler tire. I may have done something wrong here?
And then the space for turning the wheel. (steering) It seems to be to small. I used some HSP 296004 Dampers for the arrangement Please refer the Suspension pics for that.
I can try to find out if rearranging would help even in turning and for suspension