Bill: Looking at this service again, what did they use for a neutral to the buss at the bottom? The only thing I can see in the pic is what appears to be a large uninsulated solid conductor on the left side. All the others look pretty small.
I have seen panels like this with main conductors connected a couple of different ways. That shown in the pix appears to be the most common (and what the manufacturer had in mind, by the label on the door). I have also seen the main conductors attached to the lugs between the fuse pullout and the plug fuse section, and the pullout used for a stove - no main disconnect and quite a heavy load for a 60amp-rated panel