Stressfire--When, as, and if, the patron brings in the firearm in question, you will have a MUCH better idea of its condition and how to proceed. If you then want help, a photo or 2 on this forum would probably get it for you.
Assuming the rifle is a rusty, useless, unidentifiable lump, is just as erroneous as assuming that all it will need to be completely restored is a new stock.
See what the guy actually has, then proceed.
IF he ever does bring it in.
Otherwise we're merely indulging in pointless guesswork.
God Bless America