Grant,
I use a standard dew heater band on my C11, near the corrector plate. I used to have a dew shield as well, but it was a pain as I kept dislodging it as I moved around the obsy. Moreover, if I needed to cap the telescope during breaks in observing, or to produce CCD dark frames, I had to take the shield off, put the cap on and then reverse the operation to start observing again. Too much of a hassle!
I look forward to seeing your results with the RASA.
Jeremy