I used two brass slidebolts on the bottom board.( inside) They hold pretty well. I then drilled a hole in the top board and installed a cleat in the cockpit
below the bottom board. (outside)
A line with a stopper knot
gets passed through the hole in the top board from the inside and then gets cleated off on the cleat below.
To get inside you uncleat the line, remove the top two boards. You can step over the bottom board or reach the latches
from the outside.
Sorry, I haven't taken a photo
of this. I'll try to post some in the future.
Is there a better set up? probably...If the seas defeat this arrangement, I've probably got bigger problems. So far its been pretty good at keeping the cabin
dry and from keeping the boards from flying out.