How Does MMO-Champion Have Tier Models?

Ok, Idk what section this would possibly go in but it's going here.

I extracted every single file out of the MPQs and can see "RaidWarlock" .BLP files in the directory

My question is, how the hell does Bouboville put them together to make a 3D model of Tier previews? I don't get how he does it.

I tried to find them in WoW Model Viewer but I went through almost every item and couldn't find it.

There's no Google help, there's no guides online describing how he does it.. just does no one know? I have the Beta downloaded and WMV is set up to view the Beta directory.. I've already made videos of Hoptallus and the other models.

My question is, how the hell does he preview the tier sets or piece them together?