The s1 is a carbon fibre composite I am affraid as the advert from Schumacher’s own website states. So the Mardave is also actually not full carbon fibre either with grp in the centre of the carbon sandwich.
Does this mean neither car is legal?
http://www.racing-cars.com/main.asp?sitepages=mi35
"The Mi3.5 also offers you more choice, from the awesomely specified Mi3.5 PRO with full carbon fibre and titanium, available in 5 or 6 cell versions or the more durable Mi3.5 RACE (6 cell) using Schumacher’s famous S1 carbon composite material."
I am just trying to get some clarity for my local club as we would like to run to the brca handbook rules. So any guidance would be appreciated.