I've used paper models for Tabletop wargaming. I Built a Dreath Star Trench Run out of paper and card for a special event at my games club, and have made buildings and other scenics for 40K WHF, and 'The Game With No Name' (it's a western) battles.
But nothing to the awesomeness of that gunwagon! Kudos and props to you sir!
It's so much cheaper than buying the shop sold stuff!, and just as much fun to put together, and more satisfying to look at when it's finished.