That is EXCELLENT! What an awesome way to make a x-52 have FFB! Great finish on the button box too.
I bought a Logitech rumble pad at the local thrift store for additional buttons, I was also hoping that the FFB would work and would, mounted on the chassis of my chair provide further immersion. Unfortunately IL2 only provides FFB output to one device (in my case a MSFFB2), so I simply created a cradle for the rumblepad and mounted it on my desk... doesn't look anywhere near as nice as yours.
What functions , if any, are you using the "thumb" axes for?
Great job Crash, and thanks for sharing the progress pictures.
C_G