And here an example of a similar type of hull with a skeg

This is a Nacra 500

The skeg is here smoothed into the hull shape but I suspect we can do the F12 hull shape as a daggerboard design and just omit the daggerboard trunks and inject a flat plate at the keel line. Make slots in the bulkheads and just laminate it in.

We may even do it in one go. Use the skeg to align the bulkheads.

Wouter