No, making a custom unit too similar to a Defiler from 40k would be against the TOS.
Modders CANNOT under any circumstances post models that are carbon copies or way too similar to other GW's models from brands like 40K, AOS and (to some extent) even TOW or from other popular brands like LOTR and such.
That said I'm currently in no mood for modding due to irl stuff I'm dealing with and also due to the fact that I'm still waiting for the release of Asset Editor 0.63 which should fix a lot of problems that are plaguing the current release.
Also, making a fully functional Defiler is way beyond my skills anyway.

(or displaying them at all)

(to circumvent having to do the arm animations )

if you cant get arround making the arms fit the body with melee animations you could try having it be a highly mobile artillery canon of sorts, with only legs attacks

could you make one that ressembles a defiler ? (like no head and a tank-hull-like torso) if its not too complicated,., ?

So, a Defiler. Cool!

Just double checked now with DAE:
-The ROR unit is located in the ROR pool as it should be.
-The normal units are tied to the Obelisk building chains (tier V) for each Chaos God, you can see the unit cards in the building browser.
Unless you are experiencing problems recruiting these units after building a tier V Obelisk I would be inclined to say that the mod is working as intended.
In the case that you are actually reporting this issue after having actually built a tier V Obelisk then the only thing I can do is to try to replicate the issue myself to confirm if there is actually an issue with Daniel or not.
There is always the possibility that you have some other mod causing issues but I don't think that there are many DAE related mods that modify the vanilla building chains or screw with custom units recruitment.

Hey! I didnt see Legion (Daniel) being given access to this, how come?

Jul 7 Update:
-Removed WoC version of this unit from the Warband system
-Added the new Local Recruitment mod for WoC as new mod requirement (optional, only needed for recruiting this custom unit with WoC in campaign)

Sorry for the possible trouble generated by this update but I'll rather have my custom WoC units recruited with this method instead of cluttering the vanilla Warband System.

It is with a heavy heart that I must inform you that I will not be updating any of my mods in time for the Chorfs update because my potato PC has finally left me after years of honoured service.
I have already found a replacement, but since I still need to know the shipment data and because of other shenanigans going on, I can't give you an exact ETA on when I'll be back.
You have my full permission to take and update any of my mods, but keep in my mind that I'll be back eventually and I'm going to update the OG ones.
Now I know that some of you might want to leave a comment to cheer me up or ask me some questions but please DO NOT do that and keep the comment section clean so that people can read this comment and understand why I'm not updating my stuff.
Thanks for all the support and see you again when my new rig arrives.

mecha chaos warriors

this mod is awesome to play as Be'lakor / Daemon Prince

Defilers are a lil bulkier than these guys but yeah, I was mainly inspired by the Defiler's design while I was making this mod.

Oh so a Defiler from 40k, nice :D

Yeah, I'm probably going to add a few mods tomorrow.