I'm in the process of building a Wendell Hostetler Lancair. As a unique feature, I want to include functional (to some degree) avionics. Functional as in that the artificial horizon is correct, altitude, attitude, speed, gps location and map. Flight planning and so on will not be implemented.
This is the first experimental setup. It contains a raspberry pi, 2 adafruit 3.2" displays, a GPS sensor, a 4-axis gyro/accelerometer and a compass. So whatever you see on the screen, will be actually correct.
The device runs linux, i wrote the emulation in Python. Not entirely done yet, but it's getting there. I'm getting all the data from the sensors already, and finishing the graphics. Here you can see it in action with dummy data:
https://www.youtube.com/watch?v=EpwhlB9i1J4