What's the view of using Indomnitus pattern Terminator armour for the occasional HQ model?

[Orange Knight]

I'm making a big effort to get my HH army ready, and I must admit I have spent more money than I originally anticipated.

Converting some models has proven to be very costly, and the FW purchases have only added to this. 

FW recently added rules for the old 40k patterns of Terminators to be used in games of the Horus Heresy (Brilliant rules I might add), but they didn't extend those rules to allow that Terminator pattern to be used by Praetors and Consuls.

I own a Librarian in Terminator armour (the recently retired model) and I was thinking of using him as a Librarian in Cataphractii armour, as the model has a lot of details that mark him out as a Librarian. Would this be frowned upon?

[dicebod]

I don't think anyone would give you grief for a character model or two. And if they do you probably don't want to be playing against them in the first place.

[Testamentum_Veritas]

As always, I think it depends how into the lore they are, and how much effort you make to incorporate the model into the setting. 
 

Indomitus was available during the Heresy. Some legions more associated with it than others but definitely no issue with it being used. 
I would personally make the effort to remove all the 40k iconography from the model first though - purity seals, crux terminatus etc., so it fits in better. 
And rules wise, it would be a more appropriate stand in for Tartarus armour. 

Regardless though, I don’t see it being an issue. 

[Karhedron]

Even some of the iconography is fine. Is it a purity seal or is it an Oath of Moment?

I agree that fluff-wise the Crux Terminatoris would be a bit odd in an HH game.

[Arkhanist]

Indomitus has the weaker mobility of cataphractii and the poorer protection of tartaros; it was available in the heresy, but only really became common as the other two patterns got harder to supply due to their higher complexity/tech requirements. But given it's character armour either flaw can be 'fixed' by the artificers (Librarians are pretty custom anyway with the psychic hood) so I see no problem in counting it as either type for a character model, as long as such is made clear prior to the battle e.g. share your army list. 

Heraldry wise the crux is a post-heresy thing so you should swap out/smooth off that shoulder pad and remove/cover any other examples. While purity seals weren't yet a thing in the heresy, there were oaths of moment. They're a particular vow undertaken before battle by that marine, instead of a religious marking which came later as the Cult Imperialis replaced the Imperial Truth, but they often basically look the same, so you can keep those. And there should be a prominent legion symbol instead of one of the later chapters (some of course are the same symbol!)

[sarabando]

indomni is great, but if its for a character id just swap the arms or pads and use it as tarty or caty etc. 

[WrathOfTheLion]

Indomitus armor should be fine for HQs. I'd do a little work to get off any Crux Terminatus, but should be fine other than that. Obviously you'd have to run as Cataphractii or Tartaros for now as you say.

I have a few characters I've been collecting in Indomitus armor for HQs and will have to do the same now that there isn't explicit rules for consuls anymore.

[OttoVonAwesome]

I wouldn't care too bad. Extra points if you get rid of any Crux Terminatus.