Here's the rig:

Here's the damage:
Along the underside of the gutter. (Note the bubbling in the paint)...

Along the top. There's a bit of bog in there, but along the lip is cancer.

In the windscreen frame:


Gutter again, behind passenger door:

And underneath:

It's a 1990 model, 1HZ, 345000k's, full rebuild at 300 with new head. Rear quarter chop, and few other goodies aswell.
I've spent a fortune on this and I don't think I want to part with it.
I've looked at the gutters before (2008) and replaced some sections with steel and minor bog (well the old man and uncle did while I was away one weekend, cheers). But it's making a return next to where we stopped. I also mounted a shitty, solid frame roof rack to it a few weeks later and I don't think it did the bog any favours (hence the new aluminium trackmount system).
I'm confident in cleaning back and repairing the window frame, but what's the best method with the gutters?
I've seen replacement floor pans on ebay. Anyone do gutters? Anything I need to know about the roof/body attatchment at the gutters? ie flex?
I'd consider a body swap but I don't think there's a troopy out there without rust, and I can only imagine it would need a coat of paint.
Thoughts?