There is always custom fitting involved...
All of the fiberglass panels require some cutting, fitting and adjustments. The only exception I have seen are very high dollar items from Mercedes or BMW. These are parts that are maybe four or five times the cost of the stuff we might use. That is, a fender panel is four times the cost of a complete Fiat kit. I recently did an Aston Martin kit ($10,000 for the kit) that still required a fair degree of fitting. The kit came from Japan and was purported to be "perfect". The average body shop is used to perfect fittment with new parts or some adjustment with cheap aftermatket parts. That is why they may complain about the fit. The boat or fiberglass guys think nothing of it, because that is what they are accustomed to. In the end, if it is the look you want, then do it.
By the way, the parts from Ferrarikillers look pretty nice!
Bob T.
pridebody dot com