It is a $1000 boat, a survey is going to cost you $1000! I wouldn't spend money on a surveyor, assuming you could even find one near you. (very likely you can't in your location)
Is the floor soft? Does it run well? If you stand on the outdrive does the transom flex? Assuming floor and transom are solid, it looks like a pretty good deal for $1000. If the floor, especially near the back, is soft, consider $1,000 a down payment on a $6000-$8000 boat. Worst case, you could probably part out the engine, drive, and trailer for more than that.