In my opinion, the front (the hood area) seems too long. Perhaps either shorten it up a bit (not a whole lot, but a little bit), or make it so that the car isn't quite so flat-ish. Not bad so far, but I don't think the sides should be flat all the way to the top. About half way (where the windows would start) it should angle in a little. Would you like me to post some pics of my LDraw made Delorean? It's made using real LEGO pieces (duh, since it's made in LDraw), but the pieces are probably not all available in the colors I used. If you'd like me to post some pictures, I'll see if I can find any (it's been years since I even looked at the file, let alone the pictures and stuff).
Anyway, good luck on it. I look forward to more. Mouser X over and out.