The "chunkiness" in the Back to the Future car is from all the extra "sci-fi" gadgets and stuff. The model is of an actual DMC DeLorean. For under 500 polys it's a nice model - though I'd use photos to get the stainless steel quality in the skin.
I really wasn't even planning on skinning it. It was just some modeling practice, and I decided to put a quick skin on it. If I get some time, and ambition, I'll improve the skin.