Are you building with your forms on a stringer or strongback?

It's nice if you can remove some forms for use.

You should always strore the deck and hull with some forms in it with some bungee or webbing around them - sometimes they hold in by them selves.

In other words. After the outside deck is sanded and epoxied, it should sit with some forms in it or on the strong back with all the forms to prevent shrinkage. When you sand and glass the inside, remove it, glass it and when the epoxy sets up, put some of the center forms back in it and tie it up a bit. Same holds true with the deck. If the deck is shallow, use just a few where the deck has it's strongest arc.

If you don't do this, you can end up with a hull that can distort in a few inches, I had it happen a long time ago. I was able to force it open and join the two but it's a scary event.