I would give some thought to center of mass and stringer stiffness and strength before I grafted on 4 feet. The 23 isn't considered wide, and as a 27, it certainly wouldn't be.
There are a few 25 footers around. (Not stretched 23s) They are cuddys, but they can have a bit of floor out back if you don't litter the space with chairs. But either option- 23 stretched, or a 25 with it's 26 degree deadrise, would likely roll at rest. Which might not be great for a dive platform, but maybe good for getting there?
|