cast - This is what I do know. CS36T is 15500 lbs, 6500lbs ballast, cored topsides and deck, CS36M is a little lighter at 13300lbs. The Merlin has an enclosed aft cabin. I have the 34 and have at least 6 foot headroom in all areas. Not sure about berth length.
I think part of what makes it offshore capable is the build quality. For more specifics, I would suggest signing up at the CSOA yahoo group and post your questions. It is a very active site and most of the CS owners here are active on it. There are also members on there that were working for CS when they were being built.
Great men always have too much sail up. - Christopher Buckley
Vaya con Dios