My vote goes for the N°3.

In Switzerland we have very little winds and a cat without boards may not get well accepted. IMO, in lower winds the cat without boards will not go good enough against the wind.

All monohull dinghys have boards, so it can't be of a big problem. It helps the kiddies to right there cats too. Otherwise maybe a pivoting centerboards might be a solution too.


All the best and very cool looking design!