It'll probably be big enough to fit the M4 body, but the general awful "blob" look (inrecognisable driver, next to no detail whatsoever )of most off the shelf lexan interiors is what made me take up making my own with nicely detailed vacform parts as a result.
Most of the GT3 Interseries contestants have meanwhile switched to TTC parts.
Development is ongoing, with next models being the Sideways Lexus RC-F and the ScaleAuto Acura NSX GT3's.
Actually, even for the shortly available Slot It Oreca 07 LMP2 we've got a perfect fit, high detail vacform option available. Just needs a helmet.
Btw, sorry for hijacking this thread with some advertising 😉