If you use 2Simple's 2Design and Make within their Online Tools (soon to become part of the Purplemash revolution), and enjoy making various vehicles, you (or the children in your class) may have become frustrated when you've finished it, hold it in one hand and you 'accidentally' squash it out of shape.
Well, relax! There is a very simple way to stop this from happening. Once you've glued all the tabs to the parts of the vehicle, just take a piece of scrap paper and create a 'chassis' for your vehicle;
You can make it as wide as you like, but if you do make it wider it can also work as a support, that then allows you to put your creation on a turntable and let it rotate around and around!