Just a few thoughts....
I love the 917/30 and i had a spare body and an old brass chassis that i intended to use so my only cost would be tires (lots of questions) and entry free.
I did a quick mock up ,and the narrow track looks goofy under the body, not to say it cant be done just not right.
I am not a great builder but i would like to have a fighting chance to make a good showing and my current parts reduce my odds
I still may run the 917/30 but know i'm looking for a Mclaren M8 (pm if you have one to sell or rent!)
My last comment is about tires , after several searches it looks like NSR Ultras are the best choice can any body provide more insight or alternatives?
The defense rests.