I'm gonna be blunt, but constructive.
Firstly, you could save quite

of polys buy building that into the mesh. Use the cut command, to make more verts, or draw your own verts by turning on connect mode in the "tools" menu on the toolbar.
Secondly, just throwing on objects can really make a model unstable, I too modeled this way when I first started, so it happens to most of us. For example, look at the HTL Moloch. I used many objects to add detail and some parts of the model is unstable. If I redid it now I could cut 600+ polys off the total and make it much more stable using what I know now.
It looks good, and is a good start, but play around with the commands "cut" and "connect", if you really want to make it outstanding.
