If you are going to build a “good” weapon you need to make sure that it effectively does what you want it to do; a gun that hits the enemy and a tank that protects your troops (also while hitting the enemy). However it seems through history there have been some pretty ill-conceived weapons. This includes something called the Bob Semple Tank which was built by looking at a picture of a tank.
Besides having the least-threatening name ever bestowed upon a tank, the Bob Semple barely qualified as one. It was little more than a farm tractor -- and due to several design flaws, it was about as useful as one in a war zone. The designers based it on an American tractor tank, but the problem was that they had no blueprints, no building materials outside those found in a farm and no idea what the hell they were doing. They literally designed the Bob Semple by looking at a postcard of the original tank. By that logic, half of us should be able to reconstruct the Eiffel Tower.
Or was it too hard to couple the story with the right picture?