Side walls are measured and cut, with stringers attached.
Stringers all attached with glue in place, then everything is screwed together.
Different views with cover in place. I decided to make the hatch box slightly smaller than the width of the opening, because I plan to use the box for housing the electrical switches and want easy access.
Here are the switches for all the electrical components. There is a matching switch on the opposite side of the box and not pictured is the volt meter, which is mounted in the center of the box just under the lid for easy read access.