Re: narrow computer case
While most rack mount cases can have the rack ears removed, typically 4 or 5 screws, the Take 3 doesn’t appear to have removable, at least from the photos. I would e-mail their support.
At my old job I wanted to use a rack mount server I had as my primary desktop but I didn’t have the room for it either. I don’t know if this would work for you but what I did was install a small hanging rack below my desk: [url=http://www.newegg.com/Product/Product.aspx?Item=N82E16816129038]StarTech RK319WALLV 3U 19in Steel Vertical Rack and Wall Mountable Server Rack[/url]. It isn’t appropriate for heavy servers, its typical use case is network and other shallow rack gear but a shallow case works as well.
[img width=650 height=520]http://uk.startech.com/media/products/rk319wallv/Large/RK319WALLV.Elarge.jpg[/img]
I had the 3U version installed under my desk. I also have a 4U wall mounted in my closet for my networking gear. Sorry I can’t be more helpful in terms of your original request.