Nice build where the author sourced most of the parts himself. Also it looks like he plans to put the cutouts so you can purchase them on oomlout sometime soon. The total cost in materials is roughly $600. For another $200ish, you could get a Shapeoko instead. 🙂 Smaller table but more of a kit that this.
http://www.instructables.com/id/How-to-Make-a-Three-Axis-CNC-Machine-Cheaply-and-/