This is a nice general-purpose kayak. Mine is framed with cedar stringers and 1/2 inch marine plywood. It has a 12 oz. nylon skin with 2-part polyurethane coating. With my laminated fir coaming, plus Keepers foot braces, commercial flotation bags, and plenty of rigging, it weighs 30 pounds. I built mine with an extra 6 inches of length, part of which went into extra, nicely curved bow taper. This 22 in. wide boat is quite stable, decently efficient, and will heel over on edge for manuevering.
I also added a 2 cm. of height to the front coaming, to add a little more foot room. At 5 ft. 9 in. with size 9 1/2 feet, I get by with snug shoes and the foot braces. Without foot braces, somewhat larger feet will fit.
A Yost boat is not hard to build, and there are a lot of experienced builders willing to discuss the details at kayakforum.com (as well as a searchable archive, where answers to common questions are ready and waiting). If you just stumbled into this review with no previous knowledge of Yost skin-on-frame kayaks, check out yostwerks.com.
This was my 3rd Yost boat. I'm not going to submit reviews on the others, but will add brief comments here:
The Sea Rider (multichined variant) -- 17 ft. x 19 1/2 in. -- is a very efficient Greenland-ish hull, fairly stable for its width. The cockpit is small, and there's not much extra foot room. Forget about installing foot braces unless you have short legs and small feet. You have to be willing to sit with straight legs; some people love it, but I could not take it.
The Sea Otter R -- 15 ft. x 20 in. Very tender, at least with a 135 lb. paddler. Similar in design to the Sea Tour 15 R. Skip the Sea Otter and go directly to the Sea Tour.