Metric all the way, buddy! And if it weren't a one-off, I would've done an embedded system. If someone actually buys the system, I'm sure I will convert it. Windows is not an RTOS. I've been playing with the mBed system. It would be great for something like that.
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Is that in metric or imperial butt-loads?
Any reason you didn't use a microcontroller for the brain? I hate
seeing PCs used for control systems. I'm not sure how many I/Os you
need, but something like a Basic Stamp, PICaxe, or Arduino should be
more than able to handle it, and will be solid state, low power, and
idiot-proof (especially important if you start reselling these
things).