I think it is highly variable depending on the particular
boat. In other words, some boats convert quite well and I've seen some folks that did nicely taking an ex-charter vessel and turning it into an owner's boat. I think cats would generally be easier to convert. A lot of folks just take those big double cabins in the hulls and turn them into
storage rooms or workshops. Myself, having owned a cat, I think it might be a good idea to keep at least one sleeping space in a
hull and aft for
offshore use.