Okay. Personally, I love that someone attempted to make a reforged version of this amazing unit, especially with there being the High Elven and Dalaran/Kirin Tor variants of the model.
1.) Due to the preview image, I think this may be an issue with the Hive's online model viewer, I would have to download and look at the models myself, but I didn't see any of the supposed differences in the crystal and energy coloration. Also, I would suggest trying to leave solid color textures that could essentially be paint on metal to the player faction texture ID. I say this simply because it makes me want to preset a racial faction to a specific color and not everyone wants to play a particular racial faction under a more notable coloration. If posible, I would suggest modifying the chest design texture of the High Elven or Blood Elven variant of the Arcane Golem to make it a little more discernable from their kinly alternative counterpart.
Other than that, I absolutely love the models.