Hi Danny, I am very new to robot wars myself, presently building a heavy weight for the next series (fingers crossed). Over the last 20yrs I have studied the robots and types of materials used. From what I can make out and reading / listening to advise on robot builds it all depends on the opponents weaponry. I am currently laminating my shell with different materials which hopefully will give an all round protection (time will tell). Maybe you could do the same with your choice of materials. Think of plywood against solid board. The ply wood always win on strength. Hope this helps, good luck.