I'm just getting back to reading thru this very interesting subject thread posting-by-posting. I've gotten up to page 6 and 7,
https://teakdoor.com/construction-in-...ne-here-7.html
....and noticed that Danblack's house desires may have benefited from some references to this Dutch project I found recently when looking at 'floating houses'.
Waterstudio - Projects
Check out a few of the pics,....somewhat related in to the shape you are seeking, but 'flood controlled'
[note sure what you ended up with Dan, as I am only part way thru the subject thread]