Okay, my impressions:I'm holding off further kitbashes till I've painted some more. But wondering which kits people feel match up well? Arms to bodies as weapons can be made to fit provided the size is reasonable.
Orlock: Work well with GSC weapons and newer Guard sprues (the Cadian command squad was a godsend)
Delaque: Work VERY well with the GSC weapons in gloved hands, and can take some Orlock and a surprising amount of Van Saar arms. This I know from personal experience, see my Delaque with Lasguns and half my special weapons. Guard weapons work, but the arms are too thick for the spindly spooks.
Cawdor: Except Goliath and CGC, the old garbage men can (fittingly) take everything. Any disparate details only add to the tattered aesthetic they favor so much. Escher arms work surprisingly well. And actually, CGC can probably work on a Master/Blaster style Styg or simply a malformed ganger.
Escher: Can take Van Saar arms or Cawdor, if for some reason you want that. GSC shotgun arms can be made to work, but the hands are noticeably bigger. Man hands on women is a thing though, so why not?
Goliath: Can take chain axe arms from the beefy CGC dudes, beyond that they hardly fit with anything else except maybe space marine arms. I have some old Catachan arms kicking about, and those look small on Goliaths.
Van Saar: Work with nothing. They can donate parts to other gangs, but I feel their aesthetic is quite rigid, so a Van Saar with, e.g., bare arms from an Escher sprue would work proportion-wise, but look weird from a lore perspective. IMO. Edit: Oh, one thing, the Escher heads with less-outrageous hairstyle work on the female Van Saar body. I've never done that, but a friend has and it looks pretty slick.