Trapseats are anything but simple to build, particularly the clamps to clamp to the pillions and side rails. The clamps are what make the Trapseats costly because of the special tooling to get them made. Of course, we build strength into these seats to insure the disAbled sailor is secure. Its a great design a 1000% more comfortable than the standard Hobie wing seats. We just built a new batch of Trapseats, which sell for $750, which is the cheapest they have ever cost, still I realize they are still more expensive then most of us paid for our H16's. Check out the Trapseat at www.sail-s.com go to the bottom of the page and click on the Trapseat class info.