Mine is designed the same way. I had a drain from the ski locker to the bilge. However, the pathway was foamed and the water was trapped rotting the wood. I will keep it the same way foaming under the tank board and will just run 3/4 piping that will seperate everything
Problem on mine is the water fro the deck has direct access there and then there is no way out for it. I thought of doing that myself. I preferred access to the tank than a sealed coffin. As it and most boats are new.
Wanna have fun? Run your tabbing full height x 2
or
To save your back, next time do the glass to the stringers on a table x 2
I noticed when I did both layers, the second one went down nicer with less work and less resin used. Try it out.
My torpedo heater from HDBLOW takes me from 0 to 90 in the coldest winters.