Well, this is where I found the info that got me the first (PCI) cable: http://www.oliver-schubert.com/DOScard/MonCables.html - which shows that it's got good Google cred for the things I searched for.
Just hasn't been updated since 2007, and is missing the info about the PDS cable.
I figure...
tl;dr: an Excel sheet which lets you sort by which pin to reference (HD26 side, or each of the DB15 ends) to assist in assembling - see here: https://1drv.ms/x/s!AohUnCWEgUwAhYBLhNsTRlNsGaYNXQ
Buy this cable: https://www.arrow.com/en/products/cs-dsdhd26mm0-005/amphenol (the colors inside this...