Firewall Rust

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Any opinions on the level of difficulty, or even the advisability, of repairing the firewall rust?

I don't think Rust Reformer is going to help...

 
It's bad.

The hole is so big that it is not something that can be fixed with just a patch. The hole behind the glovebox actually gives access to the cavity in the front fender. I've never seen a hole there that big. (Pic with green circle)
The rust also came out on the other end, as you can see in the pic with the red circle. There, the visible rust was fixed. I doubt if the layer below, which must be worse, was fixed as well.

In order to fix it all properly, the fenders need to come off. When you're doing that, it means a respray.
When you're respraying ( around 10-20k usd seems to be a normal going rate), doing the whole body isn't uncommon.

In this case ( but also with the majority of other 'unfixed' e9's ), the rust is everywhere. Expect to need new floors, doorskins, rear valance, rear quarter panel lower patches, front fender lower A-pillar patches, new sills etc. The whole lot. That's 10k in sheet metal alone.
The front fenders look like they have rust issues, though fixable with skillfully welded patches; no need for full NOS fenders.
Outsourcing just the body work would be 50k at least in the US.

The BAT offer basically is a whole resto project where the value lies in the parts, not the body.
 

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I’d second all of that.

I’d say it’s the hardest part of the whole shell to repair as there is so much dismantling needed just to enable access, so unless you have really deep pockets and are willing to spend more than it will ever be worth, I’d pass.
 
How does rust get in that place? Is this common? Do all E9s have this weakness? I don't think so. I would be curious what event brought about conditions for rust to run wild at this very spot. Hmmm. I think I read it was bought from the New Jersey area, where it had been in storage. Wonder what precipitated this extreme corrosion. Reading what is necessary to effect a proper repair should frighten any casual buyer away. Perhaps an enthusiast with welding skills, space, time, passion for E9s, and spare $$$ could save this. Hope so.
 
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