Ok, thanks Archie. I will start programming my beetleweight this week. Here is a link to the controller board that i will use. It is only 20mm in diameter and only costs £5! It will need a programmer but Sparkfun also sell them. I will be ordering the wheels and motors soon, but first want to complete the beetleweight. More pictures of it after i have painted it. Do beetles need removable links or not?
https://www.sparkfun.com/products/11364