It’s done 
https://imgur.com/SsVCQMY
I’m pretty happy how it turned out, everything works (albeit the data display has a small delay) and setting up the buttons in DCS has been very easy. It shows up as a generic joystick, so it can be used in other games as well.
https://imgur.com/wJIN14r
20 cent for scale (lol), it really feels big
https://imgur.com/UKRwKeH
The panel itself
https://imgur.com/RF2hp3j
Some wiring, turned into a rat’s nest in the end…
In action:
https://imgur.com/LzLAj5Q