Hi Jim,
I always leave the forms in place until after the glass is on both sides. And be very sure you mask the shear with tape as you do one side then the other. This is to keep from gluing them together prematurely.
As for fairing with the forms in place be careful to keep very fresh sand paper. Change it more often than you think you should and use light pressure with the orbital sander. This is what I do to keep the forms from telegraphing through the fairing process.
I try to keep the two halves strapped on the forms as much as I can after the glass work. I use the spreader sticks when I have the two halves apart for work on hatches and stuff like that. The spreader sticks will help keep the shape correct until you are ready to join the halves into one.
If you don't have the Master's two books get them. Nick's books along with this forum will help immeasurably.
I hope this helps. Have fun with the build
Clayton