Nice! Good find.
Suspect it'll cost a lot more than you think to restore. You have a receiver and nothing else. Hardest part to find will be an '03A4 barrel.
Gunparts lists some stock parts, but no barrels. $190.95 for a Type C stock. $33.75 for a hand guard. It's the little metal bits that'll hurt most(over $3 for some of the assorted screws) and you need 'em all.
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It can be a fun project. Below is a link to mine I did back in 2009.
http://forums.gunboards.com/showthre...k-on-a-Classic