Looks like it needs to be more round (this is all just my opinion, not nessisarily right or wrong), Maybe try starting with a sphere, and use a lattice deformer to get the shape you want, then you could extract the faces for the windows and stuff... Not sure, its kinda a cool idea, your drawing makes me think of those small Helicopters.. Do you know what I am talking about? Anyways keep goin
Brian