I don't have it in front of me for the model, but it's one of those HP PDU's that came out of a server rack.  You can pick them up for $50 or so on ebay.

I think it's good for 24A total input and there are 4 c20 outlets with a 15A each.  I've ordered 12ga c20 to c13 cables, one for each miner.

The house is mostly the original AL from the early 70's.  There was a kitchen/sunroom remodel 25ish years ago that was done in copper.  Not sure how they pulled that off, I was away at school when that project was happening.  I know what you mean about century homes, several of my friends have homes that are close to a century and I'm the guy they call when they need help with something.   What's that woven cloth covered wire called?  good times.