I think you need to properly re-work the design of this before going any further. At the moment there doesn't seem to be much consideration in to what the vehicles purpose is. Is it supposed to be an armoured car, or a sports car? I can't tell. At the moment it looks like you're trying to combine the two styles by…
Right I get ya, do you think that the state of the art military equipment is good inspiration to draw from? I'm not so sure, you say "unrefined armoured sportscar" and I immediately think this (granted this is a horribly cliche example, but you see where I'm going hopefully).