Personally,

I would shy away from this gun and not be lured in by the figure in the walnut. To me, a gun to restore means maybe refinishing the wood, adding spacers, pads, maybe recheckering, etc.... The metal would have to be perfect. You can always have the gun looked at by a qualified smith during your inspection period. The screws are in surprisingly good shape considering the condition of the rest of the gun. I do agree with 500Nitro in that the rust can be in places that you would never be able to detect.