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Since Kill Team came out, I had the idea of having an IG Kill Team comprising of members of various regiments. There's plenty in the new Codex, but there's also those that had minis previously, but no longer. Any guides on Kitbashing any of these Regiments?

The only way for most of those would be third party ,look at anvil industry's, puppet wars , victoria miniatures

http://madrobotminiatures.com/
https://www.reptilian-overlords.com/

be wary if you're using for tourney though, as most parts of a model has to be GW or FW made at the eye test.

I'm primarily wanting to use GW bits, but I think there's a rule where you can get away with 1/3? 1/5? of the model being 3rd party.

In any case, I was thinking this over and I think I've come up with some kind of plan to get close. Let me know what you think or if you have better ideas:

Vostroyan:
Legs: Cadian command trenchcoat
Torso: Tempestus Scions
Arms: Cadian
Head: 3rd party

Mordian:
Legs: Cadian
Torso: Command with Medals
Arms: no Pauldrons (From varied tank sets)
Head: 3rd party or Command Officer Cap

Valhallan:
Legs: Cadian command trenchcoat
Torso: unknown, possibly medals chest w/sash made from greenstuff
Arms: no Pauldrons (From varied tank sets)
Head: 3rd party

Tallarn:
Legs: Cadian
Torso: unknown
Arms: Cadian
Head: 3rd party

Tanith:
Legs: Cadian
Torso: Cadian or Catachan. Include cloak.
Arms: Catachan
Head: non-helmeted (Catachan or Cadian)

Armageddon Steel Legion:
Legs: Cadian command trenchcoat
Torso: unknown, possibly Cadian Command (officer), Kreig, or 3rd party
Arms: Cadian or arms from vehicles (no pauldrons)
Head: Krieg or 3rd party (head in Hellhound could work for officer)
May purchase metal, but officer seems easy to kitbash

Miasmen Red Cowls:
Legs: Cadian command trenchcoat
Torso: Cadian
Arms: Cadian
Head: Mechanicus or Skitarii Rangers

Savlar Chem-Dogs:
Legs: Cadian
Torso: Neophite Hybrids
Arms: Cadian
Head: Neophite Hybrids Squad

Indigan Prefects:
Legs: Neophyte Hybrids
Torso: Tempestus Scions
Arms: Cadian
Head: Skitarii Vanguard

Ventrillian Noble:
Legs: Cadian
Torso: Tempestus Scions
Arms: Cadian
Head: Fantasy Imperial with feather hat

Elysian:
Legs: 3rd party or Cadian/Tau bash or Neophyte Hybrids
Torso: Tau
Arms: Cadian
Head: eBay Elysian

Kreig: Forgeworld

Catachan: regular purchase, Vox

You can pick up models from every one of the OOP ranges on eBay loose rather than having to kitbash them which would be far more expensive - sourcing various loose bits from places.