That is pretty cool, and I was going to say I believe Toastmaster still makes a very similar unit to this for commercial use. I see them often at Wendy's behind the counter for keeping the baked potatoes hot. I know they were still using them in places built about 10 years ago, they may still be using them. The ones I saw had the two drawers and were the built in version.
I never knew these were made for home use or in copper.