In the hypershade window scroll down through your "Create Maya Nodes" bar on the left of the window until you get to a closed submenu titled "Env Textures" click the one you want to use (based on what your reflection map is), then connect it to your Blinn materials "reflected color" attribute. When you've done that double…
Sketch Over The light blue lines are cuts you might want to make for tiling texture reasons - the one along the top for the "awning" texture, the one near the front for the rivets that are visible in the concept. Some things not in that image you might want to consider too: The roof in the concept appears to have a lip…
With the polys you have left I would model in the edges of the doors, where they meet the body or each other in the case of the back ones (unless you were planning to normal map that). They appear to have those modelled in in the images you've shown (of course the doors may be seperate it they can open, or they have an…