I've put my fuel on the bottom right looking at it from the top, and will put my brakes on the bottom left. I've then run the wires rear left(lights, fuel pump, & sender) down the top left, and the wires for the back right(lights) down the top right. I've got both of these strands exiting the tunnel at the front left where I've put an earth bolt on for all the rear end earths and the instrument cluster.
I bought a 50m roll of this stuff to put all my electric in
http://www.thetoolboxshop.com/0-328-...75nw-860-p.asp
and then a load of these
http://www.thetoolboxshop.com/0-326-...nw75-965-p.asp
which only require a small hole to be drilled.