Ah, wow.. this is looking really nice! If your going for a curved look.. then the way your doing it so far is probably your best bet... if your going for riggid.. i would model the body all from a cube, with subdivisions and poly splits . Great design! Anyways, one thing you always have to keep in mind is how to give it that extreme look . Maybe also give it some help and add some jets on the bottom ( i love jets). Or one big @$$ one on the back . Man, if i did this challenge, my car would be wonky (and nothin compared to this). Alright, cya later.