Hi - well unfortantely I'd cooked the camera on my previous attempt at cooling the sensor (this when trying to fit a peltier cooler to the sensor). So no final judgement yet on the efficacy of this Peltier-less cooling protocol. I have to choose another camera - I don't want to use my really good little super-sensitive CCD cam (although it has pretty easy access).
OK lessons learned so far ... use a thicker rubber feed pipe .. it gets pretty brittle pretty quick so be advised: no flexing of feedpipe during operation.
In the very least - this circuit chiller-in-a-can is "peltier-assist fluid". The stuff is mind-numbingly cold. Snap-crackle-pop cold
Will report back on further developments. Have a pleasant day!