I was planning on building a small barn at my office (300 yards from an airport). I decided on a 10 ft wide by 25 ft with a 9 foot opening 9 ft high. I have a 5 with the longer wingtips, so when wings folded it is longer than the 7's. It is also a tail dragger.But this is not on floats. Not sure this helps you as I have no information on floats.