About a year ago, I was able to purchase this from the original owner - who was a Westinghouse salesman. It's about 80 years old from the info I could find on it. Obviously, I added a 15-in barrel smoker for the firebox.
The first part of the build included a complete tear-down in order to replace the insulation. I replaced the paper-covered fiberglass with high-temp airplane insulation I was able to get from a friend. Beyond that, it was doing some basic metal work to replace any plastic pieces, adding the firebox/piping, and sealing everything with a ton of Red RTV.
I've been working for the past 6 weeks or so on the build (in what little spare time I have), and I'll be doing a test smoke with it hopefully in the next couple of days.
I have a lot of photos detailing this build, so I will be uploading those later to this thread as well.
Thanks for all of the help along the way!