Phill,
I have several kids, so I can speak with some experience here on what I'd like. The design looks absolutely stunning. In fact, I'll take two asap. As a parent, here's what I'd like to see:
--boat weight about 150lbs so a 12 year old could move it around on beach wheels
--high aspect rudders but skeg keel (spade rudders spin out too easily when flying a hull)
--car toppable
--minimize fittings with loosable parts (eg shackle pins)
--if there will not be a trapeze, an unstayed rig would be great too; put the mast in the hole and go.