I started with the F12 offsets, first I increased just the scale, but it looked like a power cat. next, I just stretched them longitudinally without any beam increace. It looks like that gives me 167 kg at the datum/waterline on your print. Any suggestions for a target displacement? I was thinking I'd add a little volume forward to help with the kite... But, I'll probably start with just increasing beam incrementally...
Oh, I Use SolidEdge for calcs/modeling. I'll Probably use something simple (i.e. carlson design) to uncurve the panels, and just plot the results in solid edge.

Aside: Solid Edge has a neat feature that visually analyzes curvature on compound curves, helped me find frames where my eye wasnt good at detecting excessive bend/lumps in the side panels. Very cool...