I'd be quite happy having all my electronics in a wooden box because it would be far inside the robot.

In terms of any metal, I think we should. Stick with the original idea of metal for weapons only. I am considering a Rex's robot challenge machine but with wooden armour support blocks, but a metal flipper plate and a saw in the back. Objections?

BTW Gary, I maintain ants are the easiest way to get into robots, not feathers or beetles.