How far do you go to save it?

[hchad18]

I needed a drivers side bed side to finish my short bed. I obtained one by doing some work for a friend. It had quite a bit more rust in it than I thought, the top side of the bed side is rusted and where it curves down it rusted all the way through, its also rusted around the wheel well and a couple other spots. I was going to give up until I realized I have no money and they are hard to find. So I dig in, I've got a little done tonight that I'm happy with, so I feel I can complete this. I never thought I would go this far, before I would have considered this junk and scrapped it. The pictures might be hard to see because they are upside down. How far gone does it have to be before you scrap it?