I decided to upgrade my previous method of cooking sous vide. As I noted in that post, the original version left much to be desired in terms of safety and reliability. Although I originally intended to pack all the electronics into a PC power supply case, as a test of concept I used a plastic storage container:
like my smoker.
Now, the formerly-packed case just has the heaters and thermocouple attached:
This version also has a cooling fan for the SSR (I cut slots in the side of the container for airflow).