Living in Maine with 2900 miles of coastline and a ton of lakes, streams and rivers; I have wondered why houseboat living...scaled down like this...is not done more often. It seems like an excellent way to use area. I say area because it is not land, which is kind of the point. Here people take what was a really nice field and plunk a McMansion down in the middle of it (as opposed to one corner of it) and think they have done well.
I applaud his creativity, and while I have no water bodies upon my farm, encourage others to investigate the possibilities.