Catarafter,
Glad to hear there are others out there. I have a big cataraft as well 12'x21" tubes. I dont get to use it much because I haven't found anyone to hook up with and float and I dont particularly like floating alone. I cant answer your questions on the Sol Duc but if you are ever looking for another person to float with let me know.

You may try posting on Steelheader.net. there are quite a few Catarafters over there.