Vortex Sound Research

I have a M-Audio Axiom Pro 49 key controller that's been sitting on my studio desk. I'd like to put it on a slide out tray under the desk to save space. The desk is a diy wooden monster with plenty of space for a slide out tray underneath it. The problem is the only slide out trays I can find are for preexisting desks and I cant find a generic one. Any suggestions?

TIA