The least invasive the better, having been into one Patrol/Safari rebuild like that. It came off a cow cocky's outfit for about $750 including getting it home with current WOF/Reg (how it had that I do not know).
Repair to firewall, both from guards, rear sliding windows (which to be fair was mostly a re-rubber job and a cleanup), rear doors, and patches in the rear wheel wells (cow sh1te eats all).
Roof I cleaned a little up on and got in in time I think as it never failed again as far as I am aware.
But, the least invasive you can do is the less crud transported into other areas from grinding and cutting out metal. Clean up and run it until it next needs a going over...
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