Grant Hiestand was the pilot of that model and yes it was at the NW Regionals at the Roseburg Airport. 180 degrees of water. We few lots of different models from the water.
Dave Schrum was key it making it happen. I flew my 80" piper cub on floats. I also flew a 41" span F7F tigercat on floats, my 80" camera plane on floats.
Fred Cronenwett