It won't be easy, but repairing the roof with documented proof means it is still an original bodied Sandman. Replacing the shell has its negatives as no matter how hard you try it will be visible as a rebody unless you use another Sandman shell from the same body plant for the same timeframe.
Note I didn't comment on the sensibility of the repair, just what was needed. Personally once a van has gone bad in the roof I reckon in most cases it is not worth restoring. It'd want to be a pretty special example like a black HQ 308 or something like that.
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