On the control panel front, we started drilling the control panel and tapping the backplate. Continuing on the doomed front, our hole saw for the heating element power managed to crap out on us without finishing the job, which resulted in having to use a dremel to cut and grind the holes to completion. Additionally, when I was explaining the hole positioning for the switches and indicators to my friend manning the drill press, he accidentally drilled the heating element 3-way switch as two separate switches, resulting in two misplaced holes. I haven't decided if I'm going to drop the 3-way switch in favor of two 2-way switches under each indicator and wire up a lock to prevent both being on inside, or if I'm going to drill a third hole for the 3-way and mount two potentiometers under the indicators for manual mode power control. Currently my software handles manual power control via the keypad, but switching to pots wouldn't be particularly challenging in the code.
I designed the expansion board for the Pi to handle the sensor inputs and SSR outputs and a friend is getting ready to etch and ship it for me. It was originally designed to act like a Pi shield, mounting to the GPIO pins. Since he can only etch one layer, though, I have had to go through a few rounds to get it right and I may have to abandon the shield approach entirely and use jumpers and add mounting holes. I will post the schematic once it has been finalized. The breadboard version has been working well, however, and I look forward to putting all the pieces together this week.