It looks like a fun driver but that body does looks a little rough. Which isn't bad if you don't mind working on cosmetics once in a while.
Being on a modern frame with modern systems, look at the wiring. Is there a bunch of cutting and splicing? Or did they keep it in tact? If they have the s-10 engine/trans with the electronic controls, an un-harassed wiring harness will save many future head aches. As modern systems got more complex, things that seem unrelated can be interconnected and dependent on each other. For instance, if it has auto door locks, it might need feedback to shift into drive. When doing a re-body like that and you aren't using something like the door locks, you keep the system together and hide it somewhere so it is out of the way. Check things like that to see how they handled it. If they just cut the wires they didn't need, spend some extra time with it to make sure it doesn't have any weird quirks.