Just my observation...those wires into the original panel look like they've taken quite a beating. I see a couple of spots where the insulation has been scraped off. I wonder if a J-box somewhere nearby for these circuits is in order, with new runs to the new panel? At least it would hold down the wire-nut count in the new panel.

BTW, In my part of the world, I have never seen a split-bus panel such as this with two separate lighting/appliance sections. Were these very common? Was there some kind of advantage to having a panel such as this, or is this just an older technology?

Mike (mamills)