Originally Posted by Tim R.
Seriously though, you probably do not have enough volume to have it sink resisitent and a decent cabin space.
That was my thought as well - not much room to create enclosed empty space in a boat this size.
If someone is really worried about sinking they should install a couple of heavy duty bilge pumps (one automatic, one manual), glass over all through hull openings, build a high bridge deck reducing cockpit volume, and enlarge cockpit drains. If one is really paranoid about it, get a big inflatable dinghy that can be filled with CO2 cartridges in emergency and keep it in the cabin.