I made my own for a TNT. I used oak and mounted it to the studs in the wall. In my case the equipment rack is also in the wall, so the oak goes through and mounts to the cabinet (which is in an adjacent utility room). I then got a piece of granite and put on top of the oak. You can see the results at:
http://home.mindspring.com/~rrbird/_wsn/page2.html
http://home.mindspring.com/~rrbird/_wsn/page2.html