There wood in that there foam!
I was contemplating the whole foam thing, so I went and sat in the boat staring at the mess. I thought there was some wood cross supports somewhere in there, I mean who would just want to put all the weight transfer directly to the tank? Sure enough, I caught a glimpse of some wood and started digging around. I found 2 cross supports. They were totally soaked. Aww hell, I might as well dig 'em out so they can dry off.
I removed at least 70 lbs of soaked foam. As you can see it took a good majority of the zinc chromate primer with it. I suppose I could clean it up real good and hit it with some other type of aluminum primer, being as zinc chromate is illegal nowadays. The good news is no sign of corrosion on the top of the tank ;D