I'm looking at putting the battery in the boot because of the room that i need for the intercooler piping. any hints or special tool required. from the search on the net basically what i need to do is 0 gauge cable from the engine bay to the boot. ground the earth in the engine bay and battery box vented in the boot with a decent fuse.

I have a supercharge gold battery, would this be fine in a battery box?

It should be fine in a battery box. Although, while at it, why not get a decent battery while your at it? Like a Optima yellowtop?

Also will need 0g Earth to the chassis in the boot. Probably a distribution block aswell to put your standard + wires into it. i.e. fusebox and starter motor

TUFFTR pretty much has it down pat, i would also recommend a sealed battery (eg: optima, yellow top or even a red to be cheap) so you dont have to worry about how you mount it.

Definitely go Optima battery and Moroso battery box.

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Are there any Legal, RWC or Insurance implications?

cool thanks guys, i just brought the battery last week cause the mitsubishi dimond one craped it self . I can't see any Legal, RWC or Insurance implications if its done correctlry

supercharge gold are quality stuff. no point in getting anything new if you just got it. just buy/fabricate a batt box to keep it sturdy, run a good 200A ANL fuse onto 0GA wiring to the front, cut off the existing +ve terminal in the engine bay and run it into a protected junction box into the 0ga cable, and redo the ground and youll be laughin

I think for what I have read that the cable that goes to the boot battery needs to be outside of the cabin ie under the car. But madmagna will know more about the rules :)

when i fitted my battery in the boot of my old silvia i also fitted a insulated battery post in the front of the engine bay incase you need a point to jump from...

Sealed battery in the boot means no need to ventilate it.

Good point about an insulated jumping point!