I am considering a 2012 848 evo for track. and looking into aftermarket bodywork. will the fitment work throughout all the yrs since 2008?

what's preferred; fiberglass but usually unpainted, or fully painted/clear coated ABS knock offs.

is the race bellypan a pain to put on and off ? (for DOCC tech!)

Yes same track body from '08 to present.

I think fiberglass is the best choice, its light and easy to repair.

Belly pan comes off with just 6 D-Zus fasteners, its a piece of cake.