They certainly are thin enough to fit into the clamshell without too many modifications in terms of depth. I would probably need to trim about 1/4" from the shell. You can see the gap between the screw posts which needs to close completely.
Then there's the matter of the packs fitting within the rim of the shell and much more importantly, within the rim of the wheel!
The packs look as if they would fit inside the wheel, but would they clear the thick axle and still clear the inside of the wheel???
Looks very close!
There's about a quarter inch to a third of an inch to spare so it looks as if it will indeed fit!
I'll need to remove 4 of the 6 screw posts which is kind of troubling but I think I can still support the shell in place so that the batteries don't shift. I need to think about this and try a few other configurations to see if I can keep more screw posts. Otherwise, I'm very happy!