I think the basics need to be sorted first - sporting regulations and rules, car specs, events (eg no. of races x no. of events)
Benson, I think anything over 15 would be spectacular but overall you want about 20+ to give everyone a chance to race throughout the field, plus to provide exposure to spectators and sponsors.
A good start Mr. Riced but I think you have to allow categories to maximise entries so here's my thinking
Category 1: Dseries 1.5 and 1.6
Category 2: Bseries 1.6 and 1.8
Category 3: BSeries 2.0 plus HSeries
Category 4: KSeries 2-.0/2,4 +
Each of these four categories will have basic freedoms - intake, exhaust, brakes, but limited engine mods plus suspension mods - rollbars, coilovers, strut bracing
Basic safety features for everyone along CAMS lines - fuel, rollcage, seat, fire extinguisher, etc
Control tyre and control fuel.
That's just my thinking at this point. I need to investigate more with the UK guys, talk to CAMS and AASA, plus talk to the circuit (Wakefield Park)
Peter
Keep the ideas coming guys - it inspires everyone to think that this might be possible if not 2013 then maybe 2014.