RE: Any body know what this plane is worth???
I think DonM is being generous in his valuation. I generally do not recommend buying a used trainer unless you know the history and usage of it. Not just knowing the seller. Trainers tend to lead a rough life, as this one surely appears. I suggest keep looking. Checking that "everything works" is meaningful only if the buyer has a sound understanding of what that means. It needs to work 'right". This looks like a project for an experienced buyer to rehab, and not for a person new to the hobby. There are too many things that can be messed up that are not immediately apparent.
If I were a dealer, I suppose I could put a price on just about anything, but I'm not. I'm a hobbyist, and in my view, this is not worth owning. Buy something that hasn't been so beat to death.