This is my attempt to create a mouse tray that is compatible with MonsterTech rails (used included screws that came with the MonsterTech chair mount) and has a corner cut out for the Virpil Aeromax with a module fitted on the right. 

As I like to seat on my chair reclined, the tray can be adjusted to be at a different plane (swivel) - see last photo. This is to be able to tilt it perpendicular to the ground when seat is reclined. 

I printed this with PETG-CF and works great for what it is.