Hey Doc -- Welcome to HomemadeTools.net
Be sure to check out the Homemade Engine Test Stands category if you haven't already. Also, John Niolon has a great engine stand build; not a "test stand" per se, but still a great resource: John Niolon's Engine Stand.
Also see these tags: powder coating, disc sander.
I'm going to poke around to see what we have for a metal buffer build.