I've now built 4 of this chassis type and one thing I do every time now is pre thread most of the holes before I assemble. You can simply use a good quality screw for this or use something like
The Ansmann Thread Cutter
Doing this will save quite a bit of effort during construction.
I also like to put a couple of O rings on the shock pistons (outside) to prevent the shocks bottoming out hard.
J