Ok. Thanks for your comments so far.

Gary - When you say Hardox is Cheaper and heavier what are the differences? My chassis is built from 2mm 15mm x 15mm stainless steal box section with 3mm Ali in between (see profile pic). Also what will i need for batteries and a charger? Ive got 2 x 12v drill motors for the drive and 1 12v drill motor for the weapon.

Ive had the drive working using a small batt from the old heavy and it works fine using 2 x 15a electronize and mixer.

Somehow during the build i have gone over weight and it currently weighs 12.6kg with out batteries. I am going to change my wheels with blue ones from james baker(if i remember rightly) when i get the chance. This should save 0.5 kg

Alistair - i designed the robot myself and just had it drawn to scale at work so that i knew exactly the lengths i needed to cut to get the chassis welded. Having no welding skills myself i assisted a friend at work to weld the chassis. Ever other part of the robot has been done due myself.