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1) You don't necessarily need a half cut, especially if you aren't going to be using the RHD, you'd be better off shipping and price wise to find a complete motor.
2) Yes, you need everything and there is rewiring.
3) No, half cut's do not come with hubs, and if they do, they only come with the front ones which doesn't do you much good.
4) Yes, there is more than just the calipers that need to be switched, do a search, there are lots of discussions about this, and everything else you've asked. : )
5) If you'd like, it makes fitting the hoses easier.
6) You pretty much can't, you really only need a bellhousing, the KA transmission will mate to the SR bellhousing, however, its extremely difficult to find a bellhousing.
7) A number of different places have them, Phase 2, Heavy Throttle, and myself come to mind.
8) 93, never use anything lower than 92.
Enjoy your day.