Gel batteries also don't need to be mounted uprite iirc Used to run one on my supermotos. Liquid doesn't move about or piss out if the bikes on its side.
I have very limited knowledge but managed to do my clutch and swapped in an LSD box following a tutorial on TGTT iirc. As mentioned above you have to drop the box.
Been Talking to a guy from Japan who is running the spoiler without the rest of the kit. He found it on one of the Japanese auction sites a couple of years ago but has said 2 more have come up this year. Expect to pay £500 before postage though