Knob control seemed like the best place to start. With a 3d printer (ender 3) at the ready and a variety of random components laying around (stepper motors, drivers, arduinos, etc), task one is to measure the control panel and figure out how to rotate the thermostat and heat-cool control.

The target were the screw in the upper right and position relative to knobs. Not much room to maneuver with the calipers or a ruler. So the first set of measurements were a fail.

Plan B

Use aluminum extrusion which can be adjusted as needed.

Not quite enough room in the control panel using these standard stepper motor plates but an approach in a better direction.

Measure, print and fit to verify dimensions. Nice that engineers like nice round numbers: 2 3/4" between knobs.