Further to my thoughts about categories ...
So Category 1 would exclude ED/EF Civics with B swaps
Category 2 would exclude all models with non-standard engines (that is, EGs with K series swaps)
The categories would be
Category 1 - All models using a 1.5 or 1.6 D series engine as standard. No models before 1988.
Category 2 - All models using a B Series as standard
Category 3 - Preludes, Accords using H Series (or F Series) as standard
Category 4 - All K Series models including Accord Euro, Integra R
Anyone want to have a go at ascribing models to each of these categories?
As far as the roll cage is concerned it would have to meet current safety specs as prescribed by CAMs so full cage, welded in.
Control tyre could be any manufacturer (probably invite tenders here and see what comes up)
Strut bars can be upper & lower, front & back
Control fuel eg. 98 octane but not E85.
Suggested rim sizes would be 15in for categories 1 & 2; 17in for categories 3 & 4.