I added a new external hatch to access little used space under the back table booth seat. Peterh's article and help was greatly appreciated. First I cut the opening for the hatch and epoxied supports around the opening.
I then ran a bead of marine grade silicone around the outside of the opening and attached the hatch using #10 1" stainless steal screws.
The final product installed and ready to use.
I don't have any of the fancy magnets Peterh used to keep his hatch open so I have a temp solution. I used a bar clamp attached to the belly band, shown in the last photo. Thanks for your help peterh....