I have looked into this a little and there are very large buildings on this site now and no chance of taking your shovel out to do a little digging.
Oh, we could keep going...
Actually I have a serious quesiton about this car, and forgive me if this is covered in any details in the books; I don't have access right now.
Here's the question: other than material (i.e. aluminum vs. steel) how did the "tub" differ from it's steel equivalents? Was it spot-welded (can you even spot weld aluminum?), or bonded, or riveted? Any knowledge of gauge? Hard point reinforcement? Additional ribbing or strengthening? Yes of course the cowl was different for the narrower windshield, but I'm wondering more about "design rules" for fabrication out of aluminum alloy.
Also regarding the state of de-composition, I have talked to people who have pulled airplanes out of the mud in Holland shot down or crash landed in WWII and some of these planes are flying today so I would think being in the dirt in relatively balmy Calif, the chassis might not be so de-composed. And who is to say the car isn't under part of the parking lot, which could be broken through with a skip loader in 5 minutes.