I think it was maybe 20 years ago, myself and a friend of mine who owned a
Lake Aircraft flying boat... got a tour of the Lake Aircraft factory in Sanford, Maine. The factory was in an OLD mill building in downtown Sanford. When a plane was "ready," the major parts..fusalage, wings, etc were trucked over to Sanford airport to be assembled there.
At that time, the Lake factory was also building
EDO Floats under license. The Lake flying boats didn't use floats, as the fusalage itself provided the floatation.
NB
http://en.wikipedia.org/wiki/Lake_Aircraft