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For all my seams, an epoxy fillet seam reinforced with fiberglass will be stronger than all the screws in the world lol. It also means less holes in the boat. I held it in place with copper wire (like sewn together). Once the copper was in, i could twist it with pliers to pull it in tight. I also used a long pipe clamp to pull the sides in while the glue dried. The one place I did use screws was the tunnel bottom up to the front abreast beam. You can see the screws in picture 3 underneath. Those are like 2.5" or 3" long screws. My 1/2" ply may have bent easier because it was very light weight African Okume mahogany marine ply. Lighter / less dense / easier to bend. Only 37 lbs per 4x8' sheet. https://www.boulterplywood.com/
The hatch I have in the footwell / firewall is a purchased hatch. It's plastic, and about 20" wide by 10" tall. That keeps everything up front bone-dry.
The rear hatch behind the seat isn't 100% waterproof. I just used some sticky tape rubber foam from the hardware store. it was the Double-D style like this: https://www.homedepot.com/p/Frost-Ki...25GA/100081207
I'll post pictures in the next post of how I built the hatch. I don't have any pictures of the weather-strip seal on it. That will have to wait till next spring lol.