My buddie, Rick & I assembled our rafts from compotents. The tubes are 22"x12' Frame was made 30 miles East of Seattle. We have a 9' long lower "fishing" deck. We love ours and have floated the Sol Duc and a lot of the other rivers. Don't get one too small, don't skimp on the oars. We fish waters with great success that the drift boats skip through ;\) . If you are truly interested I can give you great info.
It will save you $$$ and lots of trial & error.
Raft-Cat