This is cool, the vents on the side remind me of the warhammer 40k space marine dreadnoughts. Definately think that the model could do with more detailing to make it look busier, looks a bit empty at the moment. My only other crit is that it looks a bit too square, personally i'd either make the tracks bigger or the main section smaller but that is just personal preference.

Definately looking good though, I look forward to the updates