I have been quiet as away on business and despite the OnShape having an Android App, I couldn't get to grips with it. I managed to investigate a weapon motor alternative to the drill I had planned. I also think I will have to get the weapon machined for me rather than an off the shelf option when I was using a drill. Using a motor with lower rpm and more torque but smaller in size and weight allowed me to also change the shape slightly reducing surface area so less weight in the armour too. Here's a 'naked' snap i.e without the sidewalls. I must add drive mounts and the electrics but its coming together I think.
Evil K'Weevil v0.3.png