Yes, you should definitely build a tank around it! It's too good to just throw away. Personally, I'd switch out the two 1x1 bricks on the end of the gun for a 1x2 brick, maybe the one with the log-shaped design to it. Right now it kind of reminds me of an elephant nose. :-P It also could use just a splash of color, just some highlights. Other than that, it rocks! The shape is just awesome.