Here is a shot I posted today about using the new ST Turbo fins (low end torque). It also shows a photo sample of the SIDEKICK ama kit we were testing.
I'd say that it is a big improvement on stability, I was able to sit on the rail and reach out to the ama with a paddle in my hand. Amount of float? Not sure. Length of the arm? A little outside a normal paddle stroke. The drawing calls for a 27" tube that is then bent, so maybe 24" out from the rail... no more. I have not measured an assembled one yet.
The SIDEKICK should be available by June. $145.95 for the kit.