Long time, no news !
But the project is still ongoing, and well !
I now have all the screens (PFD, ND, engines, …) working fine, except that weather radar and terrain radar are not yet implemented. All the cockpit hardware is supported.
I am currently working on a FMC independent of Xplane, which is based on a Raspberry pi Zero. The little Raspi has a composite video output, which is perfect for driving my recycled PS-one screen and the 69 keys FMC panel is handled using pushbutton matrix connected to the Raspi GPIO port.
Here are two pictures :