For sure I'm not clear on where you would put the four motors. But there are many reasons why I do not think you would be happy with whatever you do with four of these motors. In addition to earlier comments I made about overall weight, noise and vibration, the rig balance is hard for me to imagine. And the cable for 20 amps going to batteries mounted on a belt pack would be fairly stiff and would couple to the rig. But even without these considerations, basically, I don't think it will work worth a hoot. Just my opinion.

Rich Greb
Handheld stabilizer for video cameras - Blackbird, GS2 - Camera Motion Research