Really guys? Is all this fussing necessary? I fixed up an old set of Gretschs that were left in a basement, probably for at least 20 years, without the bottom heads and hoops, and the reso bass drum head and hoop, were long gone. The damages? Two small spots on the wrap on the bass drum, the die cast hoops were toast all around, and the floor tom had been dropped on the bare edge, so it was split open. With some clamps and wood glue, it was back to normal!
Even with only a hoop on one side, none of the drums had gone out of round, except the floor tom where it had been dropped, and that drum still fit a proper head and hoop, and, for all intents and purposes, is back into round. I replaced/repainted the hoops (found NOS hoops for the toms, and a lone 60s bass drum hoop!), and replaced about half of the bass drum lugs and claws. The tom and snare lugs polished up fine, and the drums sing.
I guess I can image how a singular piece of wood in a 1-ply instrument (such as an upright bass or violin) would need extra care, but a 6-ply drum? Isn't it just too rigid? Also, more traditional instruments are carved into shape, but drums are steam-bent. So long as the glue holds, why would a drum leave its current shape? The same would go for solid shell drums that have re-rings to hold their shape (another "ply" in a sense). The chrome and metal parts seem to be in much greater danger from humidity than the shell ever could be, but if you polish them up from time to time, there's no reason the chrome can't last forever.