Oh I completely forgot about this but there actually was one true non-spec prototype at Spa over the weekend. Even though it only did some meaningless practice runs it's good to see it going
https://youtu.be/Y-YgaPHB0_8
In FP1 it was some 7,1 seconds slower than slowest running GT3 and in FP2 around 6,6. Maximum straight line speed was 24kmh slower than slowest conventional LMP3
So there's way to go...