Waow, nice to see this one !
I'm also trying to build a new R8 from this kit, inspired by the V12, but I imagined mine was more as a bi-turbo V8 !
I scratched the turbos, but I don't have enough place to build the engine how I expected to...
So I think I'll only modify the body and do as if there was a bi-turbo V8
Your modifications are quite perfect to me and accurate to the V12 model.
(I have a lot of pics but I guess you too as there aren't too difficult to find...)
What I can suggest to modify is the ugly air intakes of the opening rear hood which are a real grille on the V12 model.
other than that I don't see anything to advice as you already did a great inspired job !
If I understood well you won't modify the rear spoiler ?
Mmm... I think I will on mine, but I don 't like the square-like form of the V12 exhaust ends...
I'll probably try to keep a 4 round ends in a new spoiler.
I also plan to add fog lights in the new front spoiler and the small air intakes but maybe not exactly as the original.
Ok, and I will take a few pics soon to show it, even if I sweared no to open a new thread without being sure to be able to finish it !