Still working that design through. Getting under weight limit is killing me. Of course this is also all calculated as not drilled a hole or soldered a wire yet.

The motors, wheels and hubs look good and allow flexibility in design.
Weapon and it's motor is a problem as what I have in mind dictates chassis dimensions and will take 1/3rd the mass I predict
I will have to size the battery (LiPo) last when I see how much weight is left I have a min and max option 700mAh to 1500mAh and weights
The remainder I can spend on chassis and armour.

Here I may need to get creative. From a simple box I am moving to more complex shapes to reduce surface area. Could look really weird! Cool evil weird but weird. I think the HDPE bulkheads made from that Bonzer Board is a no go, surprising heavy but at 12.7mm it soon adds up.

I will try and generate a CAD image soon worst case next week. At the moment I have no been able to virtually assemble the parts other than the drive system.