Hey Ant, where you been man. You have missed out on a few cruises man. I'll be expecting to see ur beast at the next one.
Anyhow, in reguards to your question. All the wires you need for an audio installation should be located where the original H/U wires were. Just use the same acc amd mem wires.
In any case, the fuse block is on the bottom right hand side of the dash. The wire loom is on the inside of the dash and, a word of warning, there are a shit load of wires under there.
If you let me know exactly what you want to wire up I could give you some more details.
CAUTION: Slippery When BOOSTING!