Dave,

I can't tell from that photo, is that fed in metallic conduit, or is that NM cable as the feeders?

Metallic conduit. You can see at main/meter pic.

I don't see a ground coming in with the feeders, unless it is in metallic conduit.

Metallic conduit.

Also, that ground terminal bar looks to be connected back to the neutral terminal bar with a bare metal bar, making this panel "Suitable for Service Equipment ONLY", i.e., making it NOT suitable for non-service equipment.

If you look closely the bar ends on the left before the breakers. Attached is panel label Appears to be suitable for both Service Panel and panel if I am reading it correctly.

There is no main in that panel, right? You said it was a downstream panel in the first post, that means the main is upstream at the service equipment, right?

Right.

Have any more photos of that panel? It's starting to look 'not real good' from what we've seen and discussed *so far*.