Step 1. CSB Drilling Jigs - for Standard/SpaceSaver or MiniBlox - take the sting out of this potentially complicated marking-out process. They enable you to easily and accurately position the CSB wire anchors before commencing construction.
'Retro-fits' to pre-built chassis are possible, but it's much easier if you start with a new, unmolested chassis. This will allow you to work on a flat surface, with full access to the faces of the frames and without any obstructions.
Ideally, the frames should have circular 'rigid' bearing holes, but if they come with pre-cut hornblock openings, you can work around this using the adaptor plates supplied with the standard Jig.