Wouter. trying to do what you want by hinging off the beam would be an engineering nightmare to get that all important tolerance free fitting, any movement at the beam will be lots of movement at the tip. By engineering a solution will mean lots of extra weight which is going to mean larger foils, more induced drag, even bigger foils to overcome the drag and weight penalties, its a vicious spiral ending in failing to acheive what you wanted in the first place.

Wouter, can you instead use your time and computer model skills to design some nice J boards, they overcome most of the problems, giving good lateral support and some lift. Getting them in and out of the boat is actually quite easy if you think things through a bit. It would mean making up a new case but then even fitting assymetric boards will mean making new cases.