I'm referencing the post by Petitioner's City. He used the rules from Domination to show that "founding a gang" is part of "campaign purposes". If the example that he used is not intended to include the house gang special rules then it does not support the stance of including the house gang special rules.
The rules under "clan house" for outcasts also does specify that the gang can "purchase weapons and wargear normally restricted to their house lists" in the second paragraph. If the "campaign purposes" in the first paragraph meant that it included gang creation (weapon/wargear, house special abilities, etc) then why would they need a second paragraph concerning the house lists?
The other question is, where would you draw the line on who they can recruit. Can an outcast Escher gang recruit death maidens or wyld runners like a normal Escher gang can?
Sorry for not responding for a few days - this line of thought just really tired me out, and tbh I couldn't be bothered getting into a more lawyerly discussion. It's not me, really.
I think the best way to explain my perspective is that - always - I am fluff and world-building ideas-driven. That's how I respond to the game, how I feel it should work, and is entirely where I enjoy and do not enjoy aspects of it - and naturally this mediates how I both respond to the core rules and how I (as seen upthread) have rewritten them.
For me, how can a Goliath fighter be a Goliath - now, in modern fluff - unless they are "Unborn", "Natborn", "Vatborn". To remove that from a Goliath Clan Underhiver Gang does remove the fluff from the gang. This is the same with the other special rules - at what point does a member of the house diaspora stop being part of that diaspora, as the rules present them. Maybe all clan underhiver goliaths are Vatborn - and un-smithed - but it seems much more intriguing, and more narrative, to let players craft stories out of the upgrades for their fighters. Equally the same with archaeo-cyberteknika, chem-alchemy and so on - although you can add in restrictions, randomness, etc., to make them a bit more "poverty-chic" too (perhaps Goliath fighters randomly generate their gene-smithing, almost confrontation-/Rogue Trader-style, and the gang's starting gang rating is then adjusted accordingly before the first fight)
So ultimately I cannot answer your questions; I think it's up to you how far you push the envelope/break it/be conservative.
Book of the Outcast is a great toolbox - but even the thing you quote - there isn't a "house list" for any house gang "anymore" - unless you agree to go back to GotU, Hive War or even Gang War (and this is a choice that the book leaves up to you). Instead, there are separate lists and if you use them - you can decide possibly your outcast leader can take equipment from their House Leader list, the champs from the champ lists (although which?) and the Hive Scum from the ganger lists (and which again for Cawdor?) - but it's your own unknown territory that you have to work out, since there likely never will be (an adequate) FAQ.
But that ambiguity, as much as it is very problematic, is grand because it can go in so many weird, or "wyrd", directions. That's for me partly what this game is about - not finding abusive combos, but having a narrative reason why X or Y occurs, and trying to "play the story"/pick and choose from 30 years of work, back to
Confrontation, even.
I even worked more on this, on "playing narrative". In our ruleset, all items which are normally rare become rare after a gang is founded - you can't pick and choose in the way standard Necro runs, and we have a rare trade table (or rather, many tables). This "baked-in" narrative tool, inspired by oldmunda, mordheim and the like, kinda helps to further the narrative for players and ensure we don't end up with paramilitary mobs identikit-armed.
Something I would also emphasise is that Necromunda isn't a RAW or often even RAI game - it's a "Rules as Story", "Rules as Starting Point" and "Rules as Fluid" system. We are told this again and again in the books, since
Gang War 1, and also on online tools like the
Arbitrator's Gudie.
In addition to using the large selection supplemental rules presented in the Gang War books, Arbitrators can even introduce their own house rules to their campaigns. For example, for shorter, more brutal campaigns the Arbitrator could make the Lasting Injuries table more lethal. Perhaps all results are either a permanent injury or death, meaning being taken Out of Action always has a serious consequence.
Equally, the Arbitrator might want to increase the amount of Reputation or Turf in the campaign and double all such scenario rewards – or even grant Turf rewards for winning any scenario. With all of these tweaks the idea should always be to promote the kind of things the Arbitrator wants to see, whether it is giving gangs access to more toys by dishing out more creds, or making the game more or less lethal by making the rules for Lasting Injuries, Docs and Recovery either harsher or more friendly respectively.
Whatever changes the Arbitrator chooses to make, when creating house rules the players should always be asking themselves “does it make the game better?” and, most of all, “does it make it more fun for the players?”.
Wrangling over language in Dominion - years older than the new gang ideas - results in no conclusive way to decide this. It's up to you, your friends and colleagues - to really follow that final invective - "is it more fun?" "Yes, it probably is." "Great, try it! If it doesn't work, you can always try it differently next time".
Hence my very positive response to the idea of Cults using rules like you suggested - it could be a great fun thing! Similarly in terms of death maidens and wyld runners - I added a rule to our house rulebook that a Clan Underhiver gang can Elevate one Champion and up to two Prospects from the house list (although I'd mention that DMs are, alongside anything with a starting WS of 2+, are nerfed (and cost adjusted) in our rules too). It has led again to narrative potential, but of course it can be abused too. But I know my group are not really gonna do that.
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So don't take my own wrangling with the rules as gospel - as I said, they are
mediated by my own preferences. Instead, just take an idea and run with it - or don't, perhaps. Just have fun!