Re: Cockpit drains
Mine are not crossed. I have one two inch drain in each forward corner of the cockpit. They lead through a "T" to one through hull that is just below the waterline. (about four inches below the cockpit sole when level).
Your depth to drain will always be at the top of the water that you are floating in. This is where you have to trust the designer a bit. Your boat should float on its side. When the boat is on its side any water in the cockpit will go over the gunwales. (By this time it will probably have a little yellow in it (:-) .
When it's getting rough you should have the companionway doors shut to keep water out of the cabin. A full cockpit shouldn't sink you. A full cabin could. (Basic design again). You need to draw a little picture of things so that you can visualize it and you will probably be able to relax a little about it. Perhaps a photo of the stern and a level would help.
Seafarer 29 KCB