My only knowlege is of people buying them to place them in charter. As far as ocean crossing ability....how to put this.... Someone crossed the Pacific in an amphibious jeep back in the 50's. I wouldnt want to do that when I was young and stupid. I also met a gentelman whom had circumnavigated twice in a Yorktown, he had made his own weatherfax out of a used (obsolete) commodore and a weather radio. How he interfaced it I don't know.
Do you want to make ocean passages or do you just want to get it to home base?
How familiar are you with wood boats? I have had quite a bit of experience with wood craft and know that my current work ethic will not support it's proper maintainence.