Nacra already has a F16 compliant boat. Not optimized for the rule, but fairly close in all regards but the (dare I say it?) weight. To be exact, almost compliant as the jib is 3.71m2 whereas the box rule calls for 3.7m2, but that's close enough for me.

It's called the Nacra 500 sport. And it's a fairly good boat. There is one at our club and I actually like the simplicity of it.

As it is I don't think it would win any serious F16 racing without daggerboards and loosing 20Kgs to get to at least the Viper weight (famous last words, I'm now fully expecting Macca to show up at the F16 Euro with a Nacra 500 and humiliate us all