My question is this: is there something anyone could
recommend that would
make a good lining for the inner walls of the cabinet to insulate it from
Too bad you didn't ask me this a couple months ago, I threw away a 4 drawer
fireproof filing cabinet (and what a SOB to get rid of). It was in pretty
rough shape from sitting outside a couple years, but two layers of heavy
steel with more than an inch of firebrick inbetween is hard to beat.
Two problems with a fireproof thing, one is direct heat rise from flames,
the second is water damage from putting out the fire and the resulting
steam.
I put my stuff in cardboard boxes. :)