Sette / 1/4 berth storage drainage?

[ebb]

Mind if I chime in?
Your leaks end up on the shelf no doubt. You could drill a hole where most water collects - a hole that just fits a vinyl tube for instance - run it down to a hole in the seat you've drilled for it. Thru the settee locker and out the face of the seat thru another hole. Temporary fix.

All holes in furniture can be filled and fixed later. Believe me. in an Ariel, furniture is too big a word for the stuff we have.
Can't you make a gasket for the side lights? The water/moisture that gets in there is going to wander around between the cabin liner and the cabin mold - and dribble out where the side edges of the liner stop, right over the the shelves. Clever design. This is not a good place for sweet water as it could produce mould and odor.

The water on your shelf can also be coming from the chain plates, the stanchions. tracks, deadlights, handrails, wherever there is a thru fastening and deterioration of the balsa core. Pearson's contribution to yacht renovation. You are right tho, I know I found no balsa in the sides of the cabin, where the deadlights and the side lights are. Given that the lights as installed by the factory HAVE to leak and that there is no way to stop those leaks (as in 'the silicone smear',) then this has to be another source of liquid.

It's at best a funky solution to the problem (ie, constructing a scupper system to take leak water to the bilge.) But it might last a long while.
Don't know what goop sticks to vinyl, maybe there's some pvc flex hose you can find that you'll be able to caulk in place. [Please, don't use silicone. Use polysulfide, available in toothpaste-sized tubes.] Hope there's a solution somewhere in this.