click on Mauler arms
click copy
click on Whammy
Click paste
(Shrink 'em a little?)
OK, it may be more complicated than that (may not fit properly, or look right) but with what little experience I have with 3d modeling (made custom guitar on auto cad) it doesn't take more than a few minutes 
Well they certainly did it with the Nova Cat and Thantos to test the legs after crashing back in pre .40. I'd rather have the Mauler arms as well. I had to play Mechwarrior 2 again a few days ago just to get back that real Warhammer feeling.
And strangely it didn't feel like a Mech to me. SO if HG wants their mech back, they can have it. Maybe its the fact that it hasn't appeared in any of the games since (3, 4, Commander, etc.). But if you're going to feature Warhammer in the game, do it right, and at least model what makes it iconic - even if it isn't exact. I think Uller/Kitfox isn't supposed to be able to torso twist, for example, but its not so glaring as a fault. Having unshielded laser assemblies jammed into the arms like a nail on the end of a pencil eraser, not acceptable, even if I didn't pay for it.
Great work on the Warhammer, btw, to whoever made it.
Perhaps they intend to change it so it doesn't look like HG; this is just where they had to stop short until they could think of a better alternative design than the butt ugly re-seen version?