I know a tiny bit about some of the restorations that Ken Smith has sponsored and made happen, and the many basses he has brought back to life. I certainly don't know all of the stories; I know he has given a lot of work to several luthiers and made a lot of basses sing better than ever before.
Ken currently has an expose thread going in his forum about the cheesy, illegal, and unscrupulous things that a few luthiers have done. Its good information to have out there, to be sure.
Here's that thread:
http://www.smithbassforums.com/showthread.php?t=1651
On the other hand, there are some talented, scrupulous luthiers doing beautiful work these days. Does anybody have positive, successful, major rebuild stories to share? With either a modest bass (like mine) or some of the less modest instruments that many of you have?
Here's my thread on a positive experience with Jed Kriegel and his work:
The bass I bought
Any other stories from luthiers and/or bassists where instruments were drastically improved, transformed, rebuilt, and/or restored?