Hi all:
First off I saw that commercial also but I think the model is a Guillows kit. As far as the RCM plans PBY goes I built one about 15 years ago and it was a sweet flying plane, didn't even need wheels to fly off the grass it just scooted right off on it's belly and also would fly on one OS15 if one quit. I could even make turns into the dead engine. (carefully)