Well, I've read every post in this thread, plus some other material I found across the web, and I've ordered all the parts for my custom system. Here's a list of what's on the way or here already:
2 Optronics QH-12IT Fog Lamps from eBay (take MR-16 bulbs) ($8)
2 20 Watt MR-16 bulbs (1 36 degree, 1 15 degree), $13 from Home Depot
LightBrain Dual Controller from Trail Head Lights ($25)
2 Waterproof Switches from Trail Head Lights ($4 each)
Stop-Turn-Tail Red Led Tailight from Doran Manufacturing ($9.49 + $7.99 shipping)
Amber Velleman Strobe from All Electronics (still $8.99)
500 ma 12 volt lead acid battery charger from All Electronics ($12.75)
Various connectors, fuse holder from All Electronics (~$10)
LED flasher relay from eBay ($6)
Rubber-coated P-clamps from local hardware store ($2.50)
Food storage container with silicone seal from K-Mart ($3)
I already had a 5 AH SLA battery from a dead UPS (electronics problems, not battery problems), wire, and some suitable switches. I ordered the LightBrain to give me the ability to easily dim the lights and have automatic fallover from one bulb to the other if one should burn out. I'm planning to wire the flasher relay to the tail light lead on the S-T-T light to give me a monster blinkie. The stop lead will be wired up to a brake switch to give me a usable braking signal. Other possible additions will be a car horn (already have) and turn signals, but these might not be included until Rev. 2.0. I'll be sure to post pics as the project evolves.
Ken