Painting can be difficult.  The first model I glassed and painted, I wound up stripping it all off due to weight.  I have learned a bit more and now I have painted one that weight is OK.  It takes alot of practice to get it right.  I would advise starting witha fully sheeted model.  When you cover open bays you still have to sand it smooth to get a glass look.  If the fabric showing thru does not matter to you then go for it with anything.  But sanding open bays is a challange.