CAD just gives me a bit of re-assurance when it comes to the chassis etc but yeah will consider what you say. I just dropped the power in my batteries so hopefully that gives me a bit more breathing room.

I think the aluminium is mainly due to the way im planning on putting it together. I will get it modelled up and see how it looks. Also due to lack of tooling and equipment my plan would be to get everything plasma cut then hopefully just have a simple assembly that just needs some tapping and drilling to put it together.