As above, seen far worse repaired on here, the difference being though that most of those who repair them do it by themselves so it doesn't cost them anything other than time.
If you are willing to do the leg work then explain to him that the amount that needs doing will take time and that you will want abit of cash chucked your way. Do a proper job of fixing it and it'll be good for another 20 years, also worth a few more bob.
Big-Dan.