APU
The APU is designed with fusion 360. The design includes the front panel and a back plate for mounting the switches. And also the annunciators an knob. The texts can be found on my site under ‘Documentation’ -> (All fronts for all corry switches). In the STL-zip you will find a readme-file with everything you need.
The rotary switch I used (Reichelt)
The zip with the STL-files
The original Fusion 360 files