I cut the mobo tray to allow more space between the cages and built just a small bracket to remount it to the brace that attaches the front part of the tray to the right drive cage tower.

Sounds complicated but when you look at it, it isn't. Only issue was getting a good cut near the bottom of the case scuffed the bottom a tiny bit. But that's not a concern to me. It could be a concern to you.

gl