Ciao Daniele,
I'm sure you're going to make a wonderful work.
Please, let me advise you that the seat belts of resin cast are wrong. Italian RA fighters hadn't side belts, but just a pair of braces from a back cushion (image from Aero Detail no. 15).
The braces were fixed before pilot's belly by a chain with a spring-clip, which was fastened to seat's edge between pilot's legs (images from MC.200 manual and from AirKit news' walkaround on CR.32)
The cushion was tied to seat just by metal rings. This system was fast to unlock, and it seems it was effective during fighting, but not so when the aircraft had an emergency landing.
RCR and Eduard made photo-etched brass sheets of these braces, but to me is much better to scratchbuild them by a lead sheet.
Awaiting to see your WIP,
Best wishes
Stefano