Cubit, at 13'x 4' and about 180lbs, is the smallest, cheapest, and easiest "cabin" boat I could think of. The little house is just long enough to lie down in, and just tall enough to sit up in. Cubit has the same "slot top" cabin arrangement | use on Pencilbox. So you can walk around as in an open boat until you put up the slot covers. The mast steps off center, out of the walkway. This boat uses simple flat bottom construction and I doubt if a Twixt type V bow will work here and still allow flat space in the bow for the sleeper's feet.