Hello,
I have a Cine 60 blimp (of "Clockwork Orange" and "Godfather Pt II" fame) with my 2C. The blimp works wonders outdoors and in noiser interiors, but for studio work or smaller locations I used a barney (hunting parka) to render it absolutely silent.
Inside the blimp the IIC rests on a Cinema Products flatbase with the motor reoriented to the right of the cam on the flatbase (upright). The camera (now free of the handgrip motor directly underneath it rises 1 5/8 inches off the ground on the flatbase). There is also a Cine 60 flatbase that has the exact same specifications as the CP one; both can be found on Ebay for a reasonable price, but they are sought after items (although I'm not sure totally why unless you've got the Cine 60 blimp -- maybe for cosmetic purposes?).
Regarding the Arri 120 blimp, which I've seen but never used, I'm assuming the critter was set up for AC sync before crystal motors were employed. If that is so, is it possible at all to get a crystal motor in there (like the Cine 60 set up)? If you notice pictures of Stan Kubrick on the "Clockwork" set, he's using both 120 and the Cine 60 blimp and sharing the A/C motor with both. That's because they used a sync cable to record sound, therefore negating the use of crystal controls (might have been a year or so before the Cinema Products crystal motor came out).
Hope this is helpful -- I'd love to know more about how quiet the IIC actually is in one of those larger blimps, and if the AC sync motor options work well. Also, do those follow-focus controls inside really work, and for what lenses? I've talked with several owners of Cine 60 blimps who still can't figure out what the heck lenses the Cine 60 follow focus attachment is geared for -- not Cookes, not Zeiss... maybe Schneider, which I don't have. I'd probably have to look into retrofitting it for the lens of choice.
Tellef Johnson