Hop on The12volt.com
and you'll find all the wiring diagrams you need. I started wiring with the technical information I needed to get everything wired in and working correctly but it quickly turned into a rats nest. I just recently ripped all of my auxiliary circuits out, made full harnesses the plug ends and loom and reinstalled everything. If you look under my hood or under my dash you wouldn't be able to find what I added vs what is factory. Plus I know where all my relays and fuses are which is great for troubleshooting.
Take your time and you can put together something just as clean as the S-pod but without the cost. Let me know if you have any other specific questions about wiring and I'll help our the best I can.