I only made the bed for this model to fit with brink0417's scx24 offroad build. You just have to zip tie it down to your 6X6 frame and put a badge holder on it and away you go! The link to download other pieces of the offroad build and the chassis i used to make my SCX24 a 6x6.

Offroad build:   https://www.thingiverse.com/thing:5332590/files

6x6 conversion kit:   https://www.thingiverse.com/thing:5218067/files