Glad I can be of some help. Just out of interest, do you actually have motors or batteries yet?

Correct me if Im wrong, but in the CAD it looks like you are using SLA batteries and some sort of wiper motors for drive. If you already have these, then go ahead. But again, if your budget allows you too, go for some NiCad of NiMH batteries and some cordless drill motors. Youd be surpried how much weight and space you can save and devote to thicker armour or a better pneumatics system.

Its all costly, but it does pay off in the end. Have a look around Technobots for some better batteries. I highly recomend cordless drill motors, otherwise you will need to go about building your own gearbox and finding a way of securing your wheels to the shaft.

Do you have an approximate budget to work to? If so it would probably give us a better understanding of what you can afford. I ended up spending probably close to £700 on a basic rambot and that was with all the metalwork done for free.