Can't help much with the hull shape, the mosquito I built or should say finished building after my dad started it 20 years earlier was an association kit boat, and wouldn't have taken advantage of the measurement tolerances to obtain a better or more buoyant shape. However with any project like this, including my current project, working cleanly helps keep on track with weight, having resin or glue running down the inside of the hull whilst building doesn't do anything but add weight. In saying that I believe and the jury is out on this one, that the inside and outside should be coated with a diluted resin, to seal out water from getting into the timber, water soaking into the timber over time will cause headaches in both weight and long term maintenance.