I started the conversion of a 1949 Gibson refrigerator. I'm hoping I will be able to use if for smoking in the garage this Winter. I'm planning to mount two electric stove burners in the bottom, one for smoke generation and one for heat.
So far I've removed the inner shell and the door insulation. The fridge is insulated with fiberglass and there was no tar on the inner shell, so the insulation stayed in pretty good shape. I see no particular reason to replace it. The door insulation was a brown fibrous fluff that very much reminded me of the treated wood fiber that's used as mulch in hydroseeding. It burned very easily, So I pulled that out. Here's the first interior pic.
I think I will use J-channel mounted to the inside to hold the racks up. I'm still not sure where I'll get racks though. I'm not having any luck finding ready made racks and I'm not a welder.