Here we have some photos of the build process and internals.
The chassis with no parts mounted, showing heater and faceplate.
Top view, showing heater chamber top and faceplate front.
Heater chamber detail showing prototype heater element made of AWG 24 nichrome.
First stage of board mounting detail. Clockwise from top: MAX31855 interface board, Arduino Uno, Raspberry Pi. The Pi has had drilled-out spade terminals soldered to ground points to serve as mounting lugs.