Foster
It is only worth what you are willing to pay for it.Dosen't sound like it will ever be worth alot even when complete. Sort of like my rewelded Garand. Let the owner set the price its his gun. I suspect you will never be able to get anything out of it you put into it. I don't think you can add value to it by fixing it. If you have cash to burn go for it.
lots of luck
Tom