It took me quite a while to sort out the condensation thing. Last weekend at the SVCamp the dew was heavy both nights - as mentioned elsewhere, the setup ran dew free all night.
I took special care to expose the back of the clamp plate and seal the drainage area. A layer of ice about 2 - 3mm thick accumulated over time and stayed there until I switched the cooling off, some 8 hours later.
I always tilt the camera so that any melt water drains clear of the camera anyway - and even when I neglect to to this, I've never had a problem.
The only time I ran into serious condensation was when, for some insane reason, I decided to enclose the back of the clamp plate. Nothing like experience in the field, even if it did mean a strip down to dry out the camera - no problems since.
