thanks all guys.
Also I was sure Fujimi should produce a spyder version, but suspect after they look closely at the many little differences to the closed body they had basically to make a different model at all, specially the body.
Differences are easy, but are many.
Also this kit is really "strange" let me say: it seems like if something went wrond at the moment of royaltees or whatever cause basically is really welldone at all. Much better than any fujimi of the period (think this mould is more than 15yrs old).
Also the engine bay seems just waiting "that sprue" with all the parts to make it as a real enthusiast serie kit...tha never been.
However remains an excellent kit with a lot of details, including the real nice PE parts. Hope in the fiuture they reconsider to do something with it as spyder or 412P cars, with a very larger range of liveries available other than the 4 official cars.
After modify a little the lower rear vent I coated with Pink paint as base for the italian red. The p4 looks like Penelope pitstop vehicle right now...
Think this wip can be quite quick. I just would like to leave in the forum some easy infos on how to convert the closed version into spyder car, in my opinion much nicer ..