I have chosen to start a company up building Paddle Cat rafts. (These are the ones that have a pair of tubes, and an aluminum frame with webbing.) They are very popular on the Rogue River in Southern Oregon. Have any of you rafting guys (and gals) seen them on other rivers??
Jacks plastic welding makes many types of single man cats intended to be paddled with a kayak style paddle. They are not that popular on the runs I do around here, because they are more rigging, and less maneuverable than a standard inflatable kayak. They are great for multicast trips when you need to haul a bunch of gear.
I bought my 1st Paddle Cat back around 2003. It was used, and built by Sotar. They are extremely maneuverable, more stable in the whitewater than IV's. People have taken them down the lower Rogue (class 4's & 5's) with nothing but good things to say. I myself stay on the middle Rogue (2's & 3's).