Jeff, excellent work, nice and simple without all the wordy stuff in the original rule Wouter proposed.
Like ncik noted, allowance for the top strap of a pocket luff sail or a fully enclosed pocket, Traps I don't mind, but might be an issue with really young kids till they get the hang of it, and the hydrofoil issue can be dealt with as ncik suggested with straight blades and mounted vertically to the hull center line (this allows for canted hulls)

Cheers
RG