How much rust is too much?

I think it's all about where the rust is, too. I would fix a lot of rust damage in one, but if it's somewhere stupid, like well under the cowl for example, that's just a *****. Also, that area on tha spot on the A pillar ain't good. AT ALL. I mean.....how are you gonna treat what's UNDER that top A piller and roof skin? I'll tell you how. You AIN'T gonna. That's how. Not sayin that the car's not worth fixin......just that you have to decide for yourself how much work you wanna do and draw the line in the sand.