I have all the GT3 Cup technical manuals from Porsche Motorsport, covers every nut and bolt on these cars and all parts and servicing if you want them, quite extensive, not 100% what is inside fully,The cars IER has released are more accurate than the Kunos cars in AC...we're not going to change our process at all just because it's a Porsche. To be completely honest, the available data isn't really even that extensive - it's actually rather lackluster in places. It's a Cup car (sort of); documentation was lacking because it didn't particularly matter to the real teams (not like they could change much). Also, please realize you addressed your post to a professional 3D artist and a physics developer who has worked with over a dozen real teams and been producing cars for AC for five years.
Anyway, as far as priorities go, the P13c is taking precedent at the moment.
but as the race ratios and stuff and suspensions and damper settings and crap,
2004-2017 around 20 or so.