I told him to scrap the ladder frame and sent another set of instructions for building without it. Arch built her without that plank and filled that bilge hole with a plywood plank scribed to fit as with a shutter plank. Taped seams, the builder's friend, stuck it all together and sealed any other gaps. I went back to my drawing board and revised my plank expansions using a computer spreadsheet I had since worked up. I tell this story to point out that building boats from pre-defined panels is a different cup of tea from traditional building, and that figuring out those panel shapes can be a bit of a rocky road for the designer.
Arch reports all is in order now, it tows and rows very well with good stability and sea keeping.
I should add that sea keeping is one aspect where a round-cornered boat can outdo a hard chined boat. Arch didn't need the sailing rig for the clink, but it is essentially the same lateen rig as Tween's.