In my S13, I got a 005L battery and put that in instead of doing the battery in the boot conversion. It's like half the size of the original battery, so you can squeeze a 3" intercooler tube through the battery tray without moving it into the boot.
If you want to put it in the boot you need to:
Find a really good earth point in the boot to attatch the battery to.
Then a good thick earth strap, from the battery negative on the battery to the earth point in the boot somewhere.
For neatness you can remove the earth strap to the battery under the bonnet.
You will also need a good thick cable for the positive side which needs to be run from the battery location uner the bonnet to its new location in the boot. There are 1000 different ways to go with this and everyone will tell you a different way is best. Although as long as it doesn't chafe anything, then it'll be fine.
Then you need to disconnect the earth strap from the battery in the boot. (safety first :P)
Then you need to use either a very large fuse, or even better a circuit breaker (because you can reset it rather than just replace it if there's a problem, although they are dearer) that needs to inbetween the new positive cable you've just run through the car AT THE BOOT END (as close to the battery as sensibly possible) and the battery positive terminal.
Then connect the end of the positive cable you've just run thorough the car to the old positive connection to the battery. Obviously this needs to be very well insulated. Probably connected in a large plastic terminal box or similar would be best.
Then you need some way of holding the battery down in the boot. Two little eyelets welded into the floor of the boot at 90degrees allow you to use the original battery clamp with the two 10mm nuts on the top. You can drill the spot welds out of the old battery tray and weld that into the boot if you like.
Then connect the negative lead to the battery back up.
Some people will argue the toss on weather you need a sealed battery box, because it's now inside the cabin of the vehicle. Lots of batteries now are sealed units, so I'd say it's not nesseccary, and I can't remember what MOT says, but worth a look on the net.
For the cables and fuse sizes, you could get all of the information from the WSM to work out what you need.....or you could get the information from someone else who has already done it.
If you are still not 100% sure, then ask because a rather impressive fire can result from a c0ck-up!
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