Racks vs Custom Mounting/Shelving Solutions?

Tairan asks: "I work for a small company that has recently been growing. We are very short on space, but may be expanding in the next month or so. I just bought a couple new servers, and need a way to contain them. Right now, they are all stacked on my desk, around my office, and down the hall. I would like to have a central location where I can get to all the machines. I?ve been thinking about a rack unit. I hear many racks are extremely noisy , and quite bulky for the small amount of space they provide, so I am doubtful of that option. What I am considering, is building a custom cabinet/ shelving unit. Has anyone ever tried anything like this? What are some things I should keep in mind during my endeavor? If I do have to buy a commercial rack, are there any other considerations or recommendations from anyone?"