Du to the new batteries that have a very rectangular shape it is going to be hard to fit them in the bike. I have been working on some mockups with a friend and it looks like we should be able to fit them in… with a little effort.
The packs have alloy pressure plates with ABS between the alloy and the cells. In these images the batteries are replaced by 12mm ply (the thickness of two cells).
Here I have the larger pack (at the bottom) and the smaller pack in the approx location we are planning.
It is going to take quite a bit to mount this up properly and have room for all the other stuff required.