As mentioned, World will get you a 100% correct museum-worthy Sandcast for $21,500. If I had more money than God, that's what I would do.
However, a quick question about the Sandcast K0s:
I've seen a lot of the differences in photos between them and later 750s (oil filter cover, ignition, seat, etc), but what's the reference to the "wrinkle tank" mean? I've looked at tons of photos and can't tell WTF is the big deal with the tank? Is the paint wrinkled? Is the sheetmetal wrinkled? Why is it called a "wrinkle" tank?