I have seen a couple of ways...
one is to fit a 2x4's inside the hull and the attach them by screwing thru the outside of the hull...if you are doing glass work this should not be a big deal.
The second way is to notch 2x4's (measure first) when you pull the cap then place the 2x4's over the top of the hull to keep from spreading.
I am no expert so, do your home work. I am sure plenty of "experts" will chime in.
Have fun LOL
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