I was wandering how stable the kayaks that you built are? are they
stable enough to go down rivers with?
Yes, it is quite stable; but a mono hull kayak has advantages over an interal fraim kayak like the 4 hr kayak. If you hit a rock hard the kayaks ribs could brake and pin you in so that you would drown. We recomend that you do not go down a rive in a 4 hr kayak.