I am now working on the foreward part of the boat. Here is a mock up of the hatch and locking system that divides the boat into a wet and a dry compartment. The sleeping room is in the dry part. I belive that if you can keep yourself warm and dry you be fine in any weather.
The reason the wingscrews only have one wing is to put their center of gravity excentric. This will prevent vibrations to unscrew them when they not under pressure.
The hatch slides up and down. That mowement is guided by a labyrinth. The hatch can also mowe unrestrained towards and away from a deep gasket of 2×3 centimeter section. Turning four M10 screws will compresse it agoainst the gasket and the passage will be waterproof. This is handy in a storm when the boat is likely to capsize. That kind of conditions do not occur all the time. Therefore it is enough to close the hatch with wood pieces once it is in position. Then it gets into the labyrinth and can not fall down. This is quickly done and make it spray proof. Good enough for beating against a freash breeze with the main deck hatch open.
The above may not be totally clear due to my incomplete command of the english language. The belove pictures may help to elucidate. Click once or twice to enlarge.
Abouve the hatch
Above the two stage locking system. Fisrst I turn the wood piece then if needed for mor pressure I turn the screw.
Abowe a sketch.
To be continued…