This is similar to an idea from Sleipnir's Stuff, but I thought of it a long time ago. Make several parts for tanks(a bunch of turrets, chassis, etc.) and combine them to make your own tanks! You don't have to use ones that somebody else made! You could also use this method to add features like mine plows or missile pods to units. That's how I made my robotic Gunner Drone. What do you guys think?