My original idea was to have 4 white diamond extrusion and the battery + CB1 would be in the green section underneath. I thought the height of the 4 diamonds might be too much of a waste, so increased it to 5 so that the sizes (and hence the height) of the diamonds were smaller.

I still wasn't expecting it to be so long. It's 116mm right now. I also thought that it was a bit of a height waste, and moved the CB1 into the diamond section:

The width is also wider than I'd like, but I really should just play it safe for now and go with the highest battery capacity that should theoretically work.

I'd like to add a slight tilt to the faces of the diamond extrusions (like seen in the previous attempt) but I don't think I'd really have the space.

Solution mining... ends, in 30 days.