Never saw a left sponson quite like that before.........Any better pics of it? say, from the side?

Did you try the VIntage Hydroplanes website?? Somehow, I think I remember it there, but cannot be sure. Give them a try, they're friendly there, but it's quite a trick posting pics.

Good luck..............Give us progress reports please on the maker, and the construction when you get her done and in the water.