How much rack space do you need? If there isn't a lot of equipment (weight) you could use a small "knock down" rack. Have your cables long enough so that you can wire the knock down rack up while sitting in the floor. Once its wired lift the whole thing up and put it inside of the cabinet with the bundled cable behind it.

I think it was 3Pedal or Storch (but it may have been someone else) that posted pics of this a while back. Finished install looks perfect and its much better than fighting a rotating or slide out rack.