We would need three boats to begin with, then add more if we have success. Price, about the same as the Topaz or Dart. NOK76000 is a number I have heard mentioned. Not sure if a ply F12 is the way to go with this project though.
The F12 work you are doing, actually implementing a boat instead of just talking about it, is brilliant!

Why do you consider selling the Blade and going back to monos, or is that better discussed in private? Loosing you would be a real loss!