With this new information or verification of the original information, I'm of the opinion Bill is probably in the ballpark for value, which doesn't surprise me a whole lot.
This is a really good looking car, and with a small amount of work could be just about perfect. Most of the additional work is pretty simple to complete- inner fenders, radiator surround pieces, and a few other items are fairly simple projects to complete. Also, most of the other items mentioned above are simple bolt-ons and fairly simple to source.
As long as a person is in there, I would also remove the tank and relocate the filler location so that ridiculous filler hose isn't right in the middle of the trunk area. This may require a new tank being built, but in my opinion would be definitely worthwhile for aesthetics and for value.
The magnesium wheels are just icing on the cake, IMHO.
Bob