How Much Rust is Too Much?

[MistaGavin]

Have been looking for a Blazer for about a year up here in AK and there really aren't too many around. The few that do come up for sale have the typical rusted rockers and floors. Although this mean these trucks are fairly inexpensive, I know from restoring my 70 pickup that chasing down rust can keep you busy for a while.

This CST popped up for sale and I'm thinking about checking it out but it's 400 miles away. Looks like some pretty bad cancer on the doors and in front of the rear wheels. I know I can get patch panels, but Blazer doors are difficult to source up here. What do you guys think of the truck and the price he is asking?

http://anchorage.craigslist.org/cto/4638420468.html