Thanks for the kind words. As for the joining of the two hull halves ncik has a good flanged setup in his drawings. As my intention was to build fast I made some compromises.
For the freeboard I understand your concern, but this is a cat for kids and with the quite choppy sea condition we have here there is no real problem in the conditions you send out your kids on the water.
As for adult sailing for fun I think a 14 feet version with a moderate sailarea and a spar not exuding what you can cartop would be the solution, and there I think that such a cat would benefit from a higher freeboard.
I’m thinking of building one for myself, it would perfectly meet up to my needs.