STANDS:
I started with a pair of engine stands. Using two 1" square tubes that I bought at Lowes, I extended the stands to 42 5/8" tall. I chose this height because it allowed the car to fully rotate and still clear my garage roof. Note: You are not only having to clear the floor, but the stands also!

FRONT BRACKET:
The rotating axis for the car goes through the center of the radiator support and through the center of the rear bumper. Using 2" x 1/8" angle steel I built the bracket in the picture. The bracket bolts directly to the bumper mounting points on the frame. I built this part of it first. Next I built the extension that attached the bracket to the engine stand. The height of the extension was determined by the rotating axis of the body. This entire bracket is now bolted to the plate that would have held the engine on the original engine stand.

REAR BRACKET:
This is the simple one. It is formed from 2" x 1/8" angle steel. It bolts to the rear bumper brackets on the body. It also uses the plate that would have held the engine on the original engine stand.

CAUTION:
This setup worked for me. If you choose to build one yourself you are on your own. The drawings provided are not plans; they are only guidelines and what worked for me. Ensure that the stands you use have enough capacity to hold the car. The empty shell of a Mustang weighs more than 1200 pounds. Don't be too cheap and buy weak stands. Be sure all your welds are sound, safe, and secure. If you plan to move the car while it is up on the rotisserie make sure that both stands are connected to each other.