Hello k_damore,
My advice from many years of experience is don't take in restoration projects. Restorations are a hobby, not a business.
Do one for yourself if you feel inclined but avoid customers "dreamer projects". There is no profit to be made but plenty of debt and aggravation.
Example: I have an original 1987 Snapper series 6 RER that was given to me by a longtime friend who has now passed away.
It has taken me close to 3 years just to get it back to good operational condition. He had parked it over 15 years ago in his shop because of an oil leak, and the deck spindle had stripped the blade bar threads.
It is fortunate that parts can still be found for one of these relics. (Thank you, Forrest Gump, LOL)