Never heard(read) that.
I will be watching for that response. That would be a lot of work for only 10 gallons. It will fit but you would have to cut a lot of fiberglass and rebuild the shower seat. Or were you thinking that it could go in from the starboard v-berth locker? That bulkhead can be cut out to get under the showerseat. But it is a very odd shape.Ron Pearson put "B276", 22 gal., into the center v-berth with no cutting. I also put 22 gals. in there but had to cut because I needed a different shape to clear the thru-hulls. There are photos of that in the Photo Forum. If I were going to use such a small tank I would use the starboard v-berth locker. A much simpler installation. Then put a hatch on the front of the shower seat for lots of storage space.