Ford Econoline – frame rusted through

Hello, I have a Ford Econoline next to my PA. After a closer look I could now feel that the inner surfaces in the front frame are gone, about on hand length. Is it possible that a frame when it is lifted off from the body can be repaired including sandblasting? (there are legal difficulties?) Or would it be better to get a new (old) frame from a butcher (if you find one)? Or import a frame in the container from the states, but there must be I trust the seller again. Actually, I’m up to sell the van just because there’s no time for these works in the near future. Keep heart says, but brain says repulse….