You can see the jigs have "feet". They sit flat on the floor and locate everything at the proper angles and ride height. The next step is pretty easy. Set the car or truck at your desired ride height. I make wheel flanges on the jigs so I can even bolt on the wheels and tires. You can play with stance by moving the body up, down, or raked. When your happy with the stance, lock down the body. Make sure the jigs are square and start building your suspension mounts from the body to the jig. If it's a frame vehicle, it's pretty straight forward. K-frame cars take a little more work. Bolt rails, tubing, or whatever to the body in the previous K-frame mounts and start building mounts. You'll need to check oil pan to rack clearance. Either one will require custom steering linkage which is readily available.

Let me know if you need any additional info.

Thanks