geo wrote:

What's the logic of a metal amphib? How long will it last in salt water
service? Why not composite which is not susceptible to corrosion?

The previous version of this bird (Seahawk) had problems keeping its
wings on... http://www.glassgoose.com/seahawker_support.html

There are lots of aluminum boats in sal****er (painted and not), just
have to make sure you used the correct alloy...

Anytime you have metal in water, you'll have electrolysis, easily fixed
with sacrificial anodes. I believe all the gear is metal, regardless of
the hull material...