I want to build a plywood chine kayak/covered canoe. I am not sure of the best way to proceed since the design that I want isn't readily available. Should I build the boat full scale out of cardboard sheet working out the design and then use the cardboard as templets for my plywood or should I pursue the lofting/design drawing route? The techniques employed in the technical drawing route are not familiar to me but I am confident that the full scale model route will work for me. Anyones input on this subject would be great. The boat design is for a long distance, expedition/high volume covered canoe/Baidarka type that will be paddled in protected waters and offshore. My current boat is a highly modified gruman aluminum 17' canoe with the gunnels pinched in at the center and a tubular aluminum frame work to support a full cover bow to stern. Also, what is the maximum length I should consider making my boat. I am 6'3 and weigh 265 lbs and will be carrying close to five hundred pounds of equipment and provisions when fully loaded. I was considering a max beam of 32" at the bilge and a length of 19-19.5', little to no rocker v bottom. The boat would be paddled both seated and in a kneeling postion. Thanks.