Wow that is completely amazing LordMuffe! Its great to see your talent going to work on a Zero-K model.
Aesthetically, its gorgeous (though of course, so much of a model is in the texture). Practically, as antelope said, the penetrator currently has a very high turret so that it can shoot over friendly units. Also, if the model is too long, it may clip into other units the way that ships do, or take up a disproportionate footprint size, though it shouldnt be too bad with its current dimensions. One solution to the turret height issue is just to make the unit float higher, if you dont want to change the design.
The Penetrator model we have already is fairly decent though. While its texture is lackluster, the geometry is fairly solid. So one solution is just to adapt this as the Mace (Mumbo, the laser riot hover), which would mean you wouldnt have to raise the turret (though you may need to shorten the barrel length slightly).
Either way, if you make a really gorgeous model, we will include it one way or another.