Yes, Thunderslots will not be allowed in the Can-Am series. As to the Porsche 908/3, the 908/3 is very similar to the 908/2. I don’t know if it matches up exactly, but I think it could pass as a 908/2 with alternate/fantasy livery. I better option might be an NSR Porsche 917-10K . I don’t have one of those but I believe the body is wider.
I should have the rules up soon. I was waiting on feedback on the Thunderslots before pulling the trigger.
Russell