Nice work!

Ski boat seats

Nice work. But I will never understand a black interior in a boat.

Never did a boat interior but I believe if you put your mind to it, you can make anything possible.

All those lines are stitched, water will enter into every hole and soak the foam eventually. The pressed/welded lines are waterproof so that cannot collect water. Granted you can cover the foam with plastic but you will still get mould between the cover and the plastic..