looks good, you need to model from something more side on to get proportions correct i think. there is a tut be Mike floating around, maybe you could mail him and ask where it is or how to get it??
It is a side on referance model done in nurbs, maybe you can do that yourself anyway??
you might be able to find a better referance than the one you are using because that one requires a lot of guess work
take it easy and life will be easy