Endurance Race multi class modern (R3) and classic (S)

I was thinking of doing either a 24h 12h or 6h race using cars upgraded to R3. Thinking about running it on a Saturday 2pm BST. Not sure on dates or car list yet. The classic cars wont be really old but they will be from around the ninety's and early 2000s and the more modern cars will be from 2005 onwards. I will be accepting cars that will be allowed from you guys as long as the meet the regs and aren't too overpowered. No race ready cars !
Car regs will be out soon if this gets enough interest

Cheers xebot360

Update

I was thinking of doing either a 24h 12h or 6h  using race ready cars that are  R3 and non race ready cars that are s class. Thinking about running it on a Saturday 2pm BST. Not sure on dates or car list yet. For both classes there will be a modern and classic championship but both will be in the overall one. May extend this from one race to multiple if this get enough interest.
There will be prizes for winning and please message me if you have any queries
cheers xebot360

Do a 6hr race would be my recommendation far less logistics needed.