Floatingbear
What are you going to do with it , do you intend to fish out of it , take photographs or such ? if so then it would be different than if you just like to paddle non stop
I'm 6'2" and about 240 lb and because of a problem with the inner ear my balance isn't 100% , I balance with my eyes , I need a horizon line to know which way is up , so my needs may be much more than yours , I really can't handle a kayak more narrow than 24" and even then only if I don't stop paddling , I can't fish out of one or take pictures because of the need to keep it braced , my Laker at 26" is the absolute narrowest I can handle and still fish out of and really do feel more comfortable with some thing about 30" wide , I've found when some thing big takes my line hard it can put me in the water quick , my needs are for a very stable fishing platform
Was considering building one of the Percy Blandford designs of around 15 ft by 30" to 32" wide or maybe getting Matt to design some thing similar but due to shoulder injuries I've finally come to grips with the idea that my long term kayaking rests with getting a Hobie Outback with mirage drive
Hell I can't even get my butt into the cockpit of some of the 24" wide craft available , looked at one about 5 weeks ago , the cockpit was 18" wide , my butts about 19"
David