There is no rule limiting usage of the imported models. Why can't I use model from XGM, if it fits most from all others? Even though, what if I'm also a part of the XGM community? So, yes, everybosy can use XGMs models as far as the credits are given.
So, this is an actual melee race for your project, yea? I created a Naga race, similar ideas but different outcome, that's for sure
Although, I think the main difference that I'm seeing here is that you don't actually have any Naga units. So, is this just Mur'guls or something?