thats about the same amount of rust I have on my car, even with the holes in my frame rails it holds up. but then again I bought my Z for $1800 with 45k on the motor/trans from a 82zx and the body was immaculate, just frame rail rust and little bit of inner fender. it ran drive, hauled ass. so if it doesn't feel right, then don't force it. That car looks well cared for, for the most part. there isnt oil all over the motor, and the paint its clean, the rust in the floorpans looked like somebody lost the drain plug and then just let it sit and its starting to rust, which means its salvagable.