The design stuff coming from the group of guys working on it is impressive. (I'm learning a lot)
I'm concerned that you haven't identified the:
What
Why
How
and When
very clearly yet.
Your doing well with the How , but the what and why has been
skimmed over. (IMO)

There is nothing more difficult than designing something simple.
I know it's in design stage but there has been discussion about differant rudder assemblies, differant size sails,larger hulls for bigger guys and I think the word carbon was even used.
This sounds like a broad based formula that may not fit into the What .(your really trying to do)

Are you trying to prove you can design a new simple boat or increase the number of youth sailors? ? ?

I know from doing a lot of project management that keeping a group of engineers on point can be like hearding cats.
I get the feeling that Flatlander(John) the customer in my mind and Wouter, the engineer are not on the same page.

We really don't need a 10 boat world wide F12 class.
It also seems there is a lot more interest from abroad than in the USA.

Just my opionions and observations, Nothing personal.