I am prototyping a generic panel for Cessna, SR22, Zibo and Airbus aircraft. The panel is aluminium 150mm x 265mm cut from a kitchen kickplate:
The mapping will be:
1st row Kts/Mach toggle
2nd row encoders for SPD, HDG, ALT, V/S
4 green buttons for FD, AP1, AP2, ATHR inspired by the Airbus 350
3rd row 4 buttons/LEDs for autopilot settings
4th row 8 buttons/LEDS for autopilot settings
5th row 5 encoders for Baro, Mins, Map Zoom, VOR, ?
6th row a mix of switches and buttons: Parking brake, Flaps Up/Down, Speedbrake Arm, Speedbrake Flt, Autobrake Max,
7th row Gear
I'm waiting for better LED holders to arrive and there is space for extra controls. I've given up building a scale model, the trend is touch screen with one or two encoders and a handful of buttons. Eventually X-Plane will support the touch screen Garmin and Jet interfaces
Costs: kickplate 10$, encoders $1.20, push-buttons 20 for 5$, switches 5 for 4$, knobs+leds I had them already. I have a Saitek radio, which does all the comms. Honeycombe yoke and Saitek throttles
I think I have planned for the essentials yes?