Thanks for the input so far everyone. I appreciate it. I do have frame gauges and it actually does measure up well within the factory specs. The doors and fenders hang pretty good as well. My bubble will probably burst as soon as I drop the running gear in it.....
I didn't remove the dutchman until all of the floors had been replaced and the rear seat cross braces were welded back in. It certainly would be a mistake to take the dutchman out earlier than that. Not shown very well in the pictures was that only the center of the trunk floor was removed at the time I welded in the front/rear floors. There was still plenty enough of the original trunk pan in place to help keep things in alignment in regards to the rear structure. Being very aware of the structural integrity of the car is definitely something to keep in mind when cutting into a unibody car, but I think I did OK on this one. (is there an icon for eating crow, just in case ?) - Chris