@Narudom Busara I don't use Mobiflight, instead using a FreeJoy https://github.com/FreeJoy-Team/FreeJoy - based on STM32 board game controller, connected as general USB joystick with configured input items for my case. For RKJXT1F42001-like items I set it as 5 buttons (4 directions and encoder button) plus one encoder, then in MSFS2020 just make binding for each button and encoder in settings. The same way for all G1000 - all encoders, buttons, switches connected to STM "bluepill" or similar board, and use some multiplexors for extending number of controller inputs

There it Used on final step:

There is my solution for this joystics. Because of I'm building cocpit for VR flight, so don't need screens, leds, etc, just buttons and encoders. In this reason, there are two holes in right panel for illuminating "+" and "-", as marked on picture: So I have desined a holder for joystic: (link to stl https://disk.yandex.ru/d/i9S1e-BCa9GABQ ) and secure it with two M3 screws (use a piece of "scirt" adgesion strip for tightening): For knob I get a volume knob from Karl and do some modification: (link to stl: https://disk.yandex.ru/d/VphH9LDs9MvsfQ ) There is a short demo: Hope its will be helpful.

@jsureke same equipment, but also have VR headset, so can save a lot of money - no need screens on G1000, led indicators, gauges - only switches, buttons, knobs to "blind" interactions with cocpit

@jsureke I hope Karl provide CAD-file, and I'll can cut panel on CNC (I don't believe in my hand work skills)