For me is was a joke, of the form 'Whar my *? Whar?' For you it's a sad reality.
But it raises [not begs] the question: What would a carbon fiber tub with lightweight wheels with balloon tires do for a Schwimmwagen clone's freeboard. Wish I could come up with a pun on
wiki/Freeboard_(nautical)
Anyway, front hub motors instead of a driveshaft and diff? Hydrojet instead of dog-clutched propeller? Plexiglass bubble top like a KR200?
This is the Kubelwagen tank trainer, but you could get there with a Type 181 and bolt-on pontoons..