Hi Ken. This might be of some help possibly a lot more than you wish to go for, as you can see it can get quite complicated the further you go.
The locker seats are in them selves self draining with over laps at the front and sides the slots for the drainage from the back of the seat fore and aft is there too.
We have an added problem in the cockpit a system of air passages and shutters in the cockpit gunwales as the engine is air cooled but that has some benefits we can run it at any time in the water or out.
I hope you find these pics interesting and may be of some help.
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