That sounds cool - my only caution is that blue and gold schemes typically seem to be too clean and toy-like, or simply gaudy (and I don't think you want your Warhound to be nicknamed "Lady Gaga"). Seems to be the colors people associate with The Suns of Damnation.
There was a graphic novel done on the Black Templars (I forget the title, but I have it in French somewhere- and I know Kenetten on BBN also has it) where they were excavating a Titan in Tzeenetch colors (although I don't think they named the Legion of origin).
I'm stuck on the subject of paint schemes because I personally highly dislike crisp schemes - there must be some weathering to give me that suspension of disbelief and actually see what I'm looking at as a model and not just a large shiny toy. This seems harder to acheive the larger the model is, and even more difficult the brighter the colors. That's why I figure getting some thoughts and advice on painting it already now, perhaps so you can practice on something and see if you like it (heck, gold is really challenging to represent on a normal sized model!)