Cutting holes in the deck??
I'm planning on doing the same for mine.
Deck hatches were an option on my Formula. There's a wooden frame glassed in on the underside of the deck where they would go. All I have to do is buy the right size and cut the holes out.
In fact that's something I didn't think of. If you do put one in, glass in a mounting frame on the underside because I'm sure the hatches are screwed down.
If you're mounting one in the center and there's a raised spine down the middle, you'll have build a spacer to go around the hatch to fill in the gap.