The second edition of 'Build your own Sportscar (for as little as £250 and Race It)' covered racing modifications as per 'Locust' racing under the auspices of the 750 Motor Club. T
The new fangled 'SVA' test is also mentioned in detail - although that aspect is now superseded by the IVA. The original donor was based on a Ford escort Mk II (with front hub assembly from Cortina Mk III, IV or 5, a steering rack from an Escort with Sierra column parts etc.)
While much else was built from scratch (front wishbones etc) any number of engineering firms sprung up (and disappeared in the interim) to fill the niche of parts providers for chassis, wishbones, alloy tanks, f/glass wings, nose, lighting kits etc - as you are probably aware.
'Build your Own Sportscar on a Budget' by Chris Gibbs (Haynes) uses a more modern Sierra donor (what's one of those then?) but again with various parts made yourself i.e. wishbones (or supplied via an outsource company) and again the old SVA is mentioned. Chris Gibbs book is probably worth a look for the engineering drawings in the appendix if you are building from scratch.
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