Along the same train of thought (yep, mine derails pretty frequently!) a piece of 3/16" thick flat bar could be rolled into the proper diameter, welded together with TIG, and machined into a pretty accurate sleeve. Press fit it into a bored-out drum, anchor the pieces together with a few flat head Allen screws, and finish machine/grind the sleeved drum to the proper OEM diameter. There's no real need to start out with a full circle spool of pipe. All of that could be done with a heavy duty brake drum lathe. To roll up a liner for a 14" drum, it would require a piece of flat bar about 44" long.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!