Hi mate.
If ya find another one at the wreckers that has a good roof chances are the rest of the body should be good also.
You often see bare shells on ebay going pretty cheap.
This might be a good option, as you can rust proof etc any problems before ya swap out your bits in to it.
Maybe even respray before hand.
Alot of work but 1/2 the work done before you get it,( bare shell).
As for the rust you have now unless you can get rid of it completely it will come back , sorry.
Condensation in behind lining will find it's way to these joints again, you can try fish oil to block this, but it dries out, and you would probably have to retreat every 3 months or so.
The built up of heat and condensation attacking fish-oil, hence intensive maintance with fish oil..
Don't leave a rag that has f-oil on it and leave it in car or any where for that matter.
Many repair shops have burnt to the ground in the past, from oiled rags, can self combust.
Soak in bucket of water, or lay out flat to dry before you dispose of fishy rags.
Mate cars and our beloved 4x4 are always going to be work. the harder they are treated the more maintance they require.
Cheers
