Originally Posted by valk

I might do a vid of how I assemble bulkheads but I basically do it as giles groskamp has posted. Lay everything out loosely and wiggle it, tighten a little, move transmission, tighten some more, feel for binding repeat. The only thing that needs to be proper is prob the inner suspebsion mounts. Ill use a t square on the straight chassis edge to set those square to the edge and in line with each other.
Front front and rear rear can be shimmed to suit for arm freeness.

Transmission doesn't have to be square or measured, just free from binding.