Had this idea in my head for a while. Great news it worked. The measurements between the screw holes on the Yamaha DXR10 ar 18.25 inches and the screw holes on the Gator G-Shock 8L are 18.5. Close enough for me.
The speaker fit like a glove. Now you do have to remove the interior vertical spacer. Not a big issue, a grinder will bust the weld. After that you will need six 2" screws (I believe they are number eights) and 6 1" spacers. It helps to have the aid of a friend for the extra pair of hands. There will be a 1U space above the speaker so to help it stay in tightly, I installed a power conditioner.
Let me know what you think and questions I will answer the best I can, but for the most part it is really simple.