I have done this, takes abit of time but the bay looks much better. Check out my instagram StevieG_dck20 for some pics.
To relocate my battery I just bought battery cable and the terminals. Place the battery where you want it, measure how long the cable needs to be, cut and crimp the terminals on. My fuse box is inside the car aswel so made new cables from that too the starter/alternator.
For the brake lines being tucked, I made braided lines off the master cylinder going to bulkhead fittings in the firewall. Then running inside the car there is copper brake lines going to a 'T' piece for the fronts. Out holes in the sides of the car through and joining where the oem lines meet the braided lines in the wheel well. For the rears a braided line comes off the bulkhead fittings to a wilwood adjustable bias valve by my shifter then to a 'T' piece where the rear seats are, and then through the rear wheel arches too the rear brake lines.
cheers
