Another excelent vehicle!, I did notice a few things that you could fix really quickly. The hoses on the back of the tank need a smoothing group, or soft normals to make the edges softer, and I noticed that you actually inbedded a cross into the geometry on the back of the turret, unless were planning on having it indented into the metal, you could just add that in as a texture or a separate piece of geometry and combine it to the tank turret. And be carefull of multiple edge's ending at one vertice, like on the top of the turret, later on they play havoc with your smoothing and uv's.