Door open test - that could be pain to rig up a switch for that. Maybe just have the user acknowledge the door is closed via the LDC/buttons before starting a cycle up.
Maybe have "open door now" message for cooling at the end, and "safe to remove" once internal temp has cooled enough.
We manually soldered a board up last week. First we checked out the oven: Thermocouple in old (ancient) 4 element toaster over, fork holding it in place, feeding a multimeter.
Turned it on full, watched how long to get to ~180C for pre-soak, turning down the heat until we heard bi-metallic switch close, then cranking it back full on to get to ~230 for solder reflow phase, turned it down when it got near 240, watched for a minute, then dialed it off again. When the temp got down to 180 again we opened the door to let it cool faster.
Seeing that we had a process that seemed to work, we loaded up a board and tried it. Seemed to go okay - I have a working board, and we're going to try some more as soon as regulators are delivered (right package, wrong pinout). Not sure I'll have the controller built up (wirewrap for a test) or coded first, so the next set of boards will likely be manually processed as well.