http://cgi.ebay.com/Epiphone-Thunderbird-IV-Bass-Luthier-Parts-Project_W0QQitemZ300220632249QQihZ020QQcategoryZ4713QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Looks like an easy repair here and you'll have yourself a cool bass afterwards. Because I can't but it myself right now I'd thought I'd give you guys this one.
I'm up to my ears in projects, but it looks like a good one.
That's a real "parts" bass. :D
New ones are only $300, this is a project for someone with more time than money -- if it stays low.