Progress so far: Made a quick lid out of white packing foam. Stripped the Dork Smith 12V fridge down to its components & installed them onto the lid.
Test run last night showed the peltier will cool to -1.5C if I want it to. My plan is to cool the scope to just below ambient at the time I want to image.
A bit rough looking ATM but thats ok.
For those that don't know, the plan is to put the OTA in the box & cool the whole thing.
Edit: The last 2 pics are of the inside of the lid with the cooling plate shown.