I think I got the major details with this one: cannons, machine guns, grappling hooks, single strut in the front, wheels turn and weapons stay in place, and the silver arm covers. I know, the tank should be silver too but I lack that piece in silver/gray. The tires seem a little small still but they're the closest LEGO has at the moment. Now I'm going to have to re-do my Tumbler
*It should be noted that one piece was modified for this creation. I don't like modding in my creations but I felt it added to its awesomeness. I took a standard bar and cut about an 1/8 of an inch off for the front axle. This allowed the weapons to sit closer to the tire.