After playing a bit more with the ride stance of the VW Bug, I created legs for the platform and bolted everything to the concrete floor. I have also started building boxes to contain the wheels and tires.
I set the VW Bug body with attached platform back down on the floor. I then placed wooden blocking under the platform to determine the correct body angle and ride height. To aid in this determine I hung all the sheetmetal on the body (fenders, doors and hood).