Woah, that looks a LOT like Sketch lul. (the solid outlines of the geometry is the same style sketchUp uses.)
I would suggest using Blender rather than Milkshape... there's a super-epic tutorial for Blender at the top of this board and Blender is much more powerful and straight forward than Milkshape.
But if you've already purchased it, Im assuming you're not gonna want to do that, huh?