I just mounted Hella fog lamps and spot lamps (not using a brush bar), and customised 2 switches to go where the headlamp height adjustment switch would go. So now I need to join up the two (or six). I have all the wiring instructions but...

This is a Disco '94; there was no fog lamp switch already in place and I (assume) no wiring.

Any ideas of a good place to get the wires through the bulkhead and into the interior of the car/dashboard? Do I need to drill a new hole?
Also should I place the relays inside the car (eg. where the fuses are) rather than have them melt in the engine compartment what with Houston heat and Discovery's running real hot?
Thanks and good t'meet y'all!
(Sorry about putting this in "memorabilia", how'd that happen?)