Have a look at the picture below. As you can see from the CAD background the rack I am trying to create has a "tunnel" through it. The pink lines show where the tunnel is in the rack. Furthermore, beyond the tunnel, there is half a rack space, followed by three full ones and ending with a single. I have tried a number of things using the "Dimensions" tab but the closest I can come is to break this up into multiple racks. Any ideas? Is this even possible using a single rack? It seemed to me that in the previous rack, you could create a true "franken-rack" as I'm describing.