Here locally, Illinois, there are several "Cardboard Cup" events. Most of the boats turn out to be canoe or kayak shapes. My exposure was a corporate entry that turned out to do rather well. Most of the boats are considered temporary, but this one actually survived several years.
I'll see if I can attache a picture.
The design was a "streched-limo" concept using an average canoe shape for the ends. The construction was two layers of diagonal strips over conical panels, with a layer of longitudinal lamination. The strips were three inches wide. The material was double-corrugated. The event rules were "no two-component glue". We found that water-dispersed-vinyl adhesive, the stuff they use to glue the bottoms of cardboard boxes, to be the perfect glue.
The basic numbers were; 30 ft LOA, Empty weight 200 Lbs, Racing weight 1800 Lbs (eight-man crew).
(I don't see the pic in "Preview Post", so if they don't show up, I'll read the directions and try again.)