I thought I might chime in on this thread. Since I now work for a company that assembles, designs, and consults on PCBs I thought I would put in a shameless plug for our services in case you want to do volume production on a prebuilt version.

http://www.njc.com

You probably won't deal with me directly though.

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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png