So then I guess there is no point in making a slaver tattoo...
I'd still say it might be worth doing, as :
1) People might want to play/roleplay a slaver character, with tattoo and everything chosen from the start.
2) If there are any 3D NPCs, then this would be applicable to slavers.
3) We might be able to add an extra layer for this... or put it on an existing one i.e. "slavers can't have moustaches, they have a tattoo instead". I do think it would be nice to mark slavers, as it seems quite a decisive "us vs them" in the Fallout universe. Great reason to kill someone on sight in the wasteland.
4) Although the primary and first focus is making the models for 2238, I'm pretty sure the majority of 3D stuff is also 'open' for other people to use in mods. Someone's going to want that. Be nice to have "all slavers in all Fonline mods made by anyone from this point onwards" with your work in it.
5) There's no guarantee any individual piece of the 3D work we've done will end up in 2238, but a lot of is being made anyway, for whoever wants it (or simply for our own joy of learning and creating). Once we've made enough things, the devs will pick and choose what they need from it. For example, we've got a lot of armour variations. They might want to keep things simple and stick with 3D versions of what currently exists.
6) I think you'd do a good job of it