In real life... a square bot with a ton of plating to protect the innards would be suitable for battle. With this game, its kinda the opposite. Anything you can put outside the basic structure of the bot will keep the precious chassis and even more so precious contents safe. As an exercise, try to make the smallest chassis you can make to fit a battery/control board/and maybe a snapper or two, then see what you can attach to the snappers to make the bot mobile/damaging/and protected. This will teach you to congest things to a smaller chassis. Because, remember, in battle... if a bot does a ton of damage to your chassis you are done for pretty quick... if the opponent nips away at exterior parts first before getting to the core, your bot has a better chance at surviving longer and winning the bout.
OH MY GOD IT'S JAWS!