I wouldn't say F16 and F18 aren't linked at all... Nacra could be interested since AHPC has 'officially' launched a F16 now.

Making the minimum weight higher could allow Nacra to use parts they use on the F18 on the F16. Meaning economy of scale and less risk if their project fails.

I know they would have to come up with new hulls, etc. but the only Infusion type hull Nacra has at the moment is the F18. The F17 hull is still the old shape. Maybe while updating it they will change it into a 16 footer?
On the other hand I don't know how big the (inter) F17 class is. Maybe it's a stupid idea that Nacra would take the F17 out of production.

Anyway, I've been sailing my Blade with my girlfriend now for 1 year on the Northsea and I'm pretty convinced the platform is as solid as any other out there.

Regards,
Gill