I think the F12 is still a great idea, even though the older cats fit the bill hardly any kids are sailing them. I travelled a lot last year and personally have only seen kids on my AC's. IMO the F12 thread has got people talking, thinking, acting so thats a good outcome. The F12 is really going to modernise the sport and hopefully attract kids, it also gets new cats on the water in a low price range. My kids are looking forward to building the F12's with me and to be honest thats a good enough reason. My daughters used to crew for me on my Stingray at your girls age and still remember their first pitchpole with excitement.
regards