Huf Haus is the way to go. The one Antonio Banderas had built in Surrey is stunning:
https://www.huf-haus.com/en.html
http://www.dailymail.co.uk/femail/a...ntonio-Banderas-s-2-4million-Surrey-home.html
I like the look of that, there are some house boats in Newhaven near Denton Island, funny enough none of them look anything like the one in the photo.
I used to know some people that lived on one of them in the 80s