From fishwaltz

I went to shim stock. A couple pieces of shim stock on the leg (spur) mounts, the mounted cymbal lug and the tom mount works wonders, and conforms to the shell while adding the necessary strength to it.

So none of my local shops had shim stock, one place knew what it was.LoLoLoLo

...but I did find a 4x4' piece of 1/8" luan at my lumber yard. I've uninstalled the cymbal and spur mounts and will glue a piece behind each as well as on the hoops (bass pedal & anchor spots). I'm shaping a section of the ply inside the bass drum.

Question: for adhearing the support pieces, would you recommend wood glue or epoxy? I've got both.

Thanks again for all the great tips,

Brian