I spoke to a guy a long time ago that was doing builder assist with floats,
and he had built at least a couple with O-320's. I have an IO-240B, and if the weight
is close to the same I'd be more than willing to do it if I built another one ...

Adding an extra 30-40 hp would be great Not sure you could categorize it
as an entry level Kitfox anymore, it would be more like the advanced model,
but I bet it would be fun to fly ...

Jeff