When I built my T26 my oldest brother was pretty fascinated and would ask tons of questions. One day when I called him he announced he was building a cat too. I asked him what design he was doing to which he said "oh I looked at the pictures on Wharram's site and started building." It's a bit of a mash up but then he lives in Nova Scotia where that is the way boats have been done for generations. It works well. Here's a video.