Yeah was real easy todo it, A mate lol
You can vent the battery if it has a vent output just run a pipe to the vent behind the bumper. But it's best to use a dry cell battery as they don't need venting and will never leak as there solid state (no battery acid in them)
Run a power cable to the starter from the battery (don't use audio cable) welding cable is the cheapest though
Then earth the battery in the boot (make sure you strip the paint off so its bare metal)
For the other small power cables coming off the battery terminal just use a junction box and tuck them away under the bonnet somewhere
Thats pretty much it mate
