Ah I thought the battery was on the top tube. Now I realise that's the controller that you mentioned before. I would have put the controller in the bag as well. But... the controller is huge, is that box full of stuff, or can't it be opened?
It would be fantastic if you coul list the vendors. I have been very actively considering going this route but lack time. Your help would be much appreciated.
That black box on the top tube holds the controller and all the cables. Most of the space inside the box is taken up by excess cables.
In previous builds I had the controller and battery inside the bag. But the disadvantages of that is heat and portability.
I'll put together a parts list when I can.