Fluff,
I've never actually seen a Cruiser that shade of blue/green (I think that your colour code more-closely resembles the colour that is showing through on the scratches on the side of the bed or your interior). Also, the roof is not often the same colour as the body, nor are the hold-down hooks on the hood. I've also never seen a sag in factory paint. Additionally, that rubber beading between the rain gutter and the sides of the top is meant to be black rubber, not paint-covered.
That said, the spot-weld marks on the bed are actually a good sign, as they indicate that there is no bondo under there. From the photos, I would also think that the interior is original paint. Over-all, it looks to be in decent condition, and I would be very, very suprised if it was not re-painted. But who cares?
Either keep it as it is, and use it is a work truck/play thing or sand it down and re-paint it. Either way, you will have a great ride. You will be amazed how easy it is to strip that truck down to nothing and re-build it. You have a wonderful platform to start with, and you will have a great machine when you are done... and if the cat likes it, you can't go wrong.
Josh