Hi,
1. Yes there is a full watertight bulkhead door between aft cabin and passage way forward as in a SM. 

2. the lazarette at stern is probably half the width of the stern more to port, but there is therefore a significant part of stern without a water tight lazarette crash zone.

hope that helps

alan
Gorodish
Mango nr 52
about to leave Grand Canaria for Caribbean