Since the goblins are already rigged, I guess Naz can run a test game of Moria vs. Moria in the private beta with as many goblin units as possible and see how the game engine behaves. It may give an answer to the issue of high poly models potentially crashing the game.
Here you are Games Workshop painted version of Fimbul, in case it's of any use as reference material:
Edited by Arthadan, 09 August 2014 - 08:40 PM.