VT,
Here is one very much like what I did.
Hidden Hitch - Articles
I used angle iron and sheet steel instead of the Machined Blocks. And bolted through the bumper. The hard part is making the hole for the receiver. You move the tow hook 6" to the right and use it for the safety chains. I have the same wire harness for the lights. The ball and hitch slide in and lock in place with a key. Completely hidden when removed from the car.
Great set up and I used it for 4 years. Now I have a Trailex Trailer and dont need.
Van914