I'd bought the sacrificial cam for spares so was surprised (and stoked) that it worked when I got it. It's a shame it made it this far only to fall at the final hurdle
But still...onwards and...I performed surgery on my remaining working 1100D, and here it is... it ain't pretty, but that's what prototypes are for
I did get the Peltier, heatsink and fan running on it earlier. My Peltier is the 30W version from Jaycar. At full power, 5 minute dark subs at ISO1600 were reporting a temperature of 14C in the EXIF tag. At approx. 2/3 power (20W) it was recording 17C. It's been another warm and humid day up here and the room temperature was reading 26-27C, and when I ran some subs to warm up the sensor before starting the cooler the EXIF tags were showing 32C. That gets me in the ball park of where I want to be. I can live without totally clean darks if it simplifies the dew situation, as the noise is very manageable with the EXIF temp reading around 10C.
There's some trimming to be done to the copper and some additional insulation to add, as I had an iceberg form on the very end of the copper (foreground in the third pic) after the Peltier had been running for a while. I also need to sort the power out as I'm using a DC coupler, and I need a neater USB cable solution...oh and a hole for the lens eject button