They are 12 inches deep at the top and 16 at the base.
If you look on prior threads (
http://forums.radioreference.com/pi...le-setup/316394-n9jig-az-shack-completed.html) you can see some of the inside pics, they get a little crowded...
For now anyway the antenna cables are kind of short so it makes it a little tough to get at the rear of the racks, I plan on putting in a patch panel this summer so I can use jumpers for the antennas, that will let me move the cabinets easier for servicing.
I am also thinking of having the woodworking club here build a table for me on casters so I can get to the rear easier. I thought of building a false wall with a chase to get at the back but that got shot down by the CEO (wife).