It's hard to appreciate just how big the 30-inch tube is unless there's a person standing next to it for scale. Scroll down on this page to the photo with Allen Dumont:
http://www.earlytelevision.org/dumont_ra-119.html
Like others, I would enjoy seeing a couple of photos of that shop.
Regards,
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html