[Arran]

I electrically restored one of these same sets a few years ago, but never bothered with pictures. I seem to recall replacing some of the chassis wiring, but the wiring that must be replaced is that going into the IF cans, once it gets disturbed you can end up with bare wire touching the chassis. It's tricky to get them apart, in fact you have to remove each transformer, wires and all, from the chassis before you can remove the clip that holds the coil inside, but more importantly to get it back on. 20 gauge solid core is fine for the chassis wire, but I would use stranded inside the IF cans, or just copy whatever Philco used.
Regards
Arran