Mark... I'm going to give you the breakdown on the 22' in case you are still looking/ debating The actual hull is very similar to the seacraft in design as it is a stepped hull with a bit of flair in the bow- very soft riding and fast too. The hull is extremely beefy and great in a sea. I own a 1974 S-22 built by the original North American Corporation located in florida. I tore the boat apart to a bare hull and rebuilt the whole beast. The hull is layed up really heavily with 24 oz woven roving and 1.5oz chopped strand mat(sandwiched throughout), and is about 1/2 inch thick at any given point except the transom which is about 1 and 1/2 inches thick(also layed up heavy with roving). As the last post noted, the existing cabin did infact have some flex to it, but i was making it a center console, so i sawzalled it out after laying out for a coaming in the bow as i wanted to open it right up for fishing. I ripped up the decks which were soft and took out around 400 pounds of wet flotation foam (from the stern) and replaced two of the four existing stringers which were rotted. Next, I fiberglassed the old outdrive hole closed and backed the transom with four pieces of 3/4 plywood; each lamination with resin and all encased in new roving and mat. I affixed a Gil Bracket and added a 140 horse evinrude outboard and a 110 gallon tank, next i built a pilot house (dog house) and put in new decks, raising the original deck height 4" for self-bailing. The boat is incredible-i have fished on a few seacrafts: 20'and 23'(very frequently on the 23' owned by my brother in law) and this boat is pretty close in sea performance, (it doesnt sit very low in the ass end with all that wet foam removed) and I'm planning on fishing it commercially for tuna. This boat is great and it would be hard to talk me into trading for a seacraft as the north american is a much thicker hull and doesnt rattle and twist slightly like the seacrafts do when in a big sea- it lacks the weight too- it does 22 cruise, 30 knots top with the 140 horse outboard (pretty economical compared to a v8 I/O). The later models were made by another company as i understand it (larson?) i'm not sure, but the construction changed after later in the 1970's as did the design slightly, which is the same deal with seacrafts- the good ones were potter builts through the 60's and 70's. Hope i gave you more than a little insight- although I no nothing of the 26' model. Here's a link to some pics to show you the finished product...
http://bjgreen9517.friendpages.com/ (click on the photos bar) (P.S. the seacraft is one of the best small boats out there, so no hate replies please, just be advised that other nice boats in the same size range do exist, I own one...) BJGreen