I can relate to what you are saying about realestate prices on Oahu. Especially when looking from Miss. crazy isn't it?
My first inquiry about shipping costs to the mainland for the 310 got a quote for $7,800
this is part of the premium for living in Hawaii I guess. And part of what makes building here so dear.
It turns out the 310 is a gasser not a diesel, And my buddy is starting to realize its value with the original interior. So it may have a life there on the farm for a while.
Then could serve as a nice guest house for someone here on Kauai if he decides to sell it on.