For the SMBUS reader you can order the chip @ radiospares, farnell or any other mail-order electronic retailer.
The internal diode is not perfect at all, but if you calibrate it you'll have a good precision. I do not know a way of reading the diode without having the CPU running though, so calibration may be tricky. I may be wrong on that one, if someone knows better please tell us.
Forget about drilling a hole in your mobo. They are all multi-layered, IIRC DDR ram requires 8 layers at least.
Pointing an airflow at a temp diode doesn't sound as a good idea... Air flow is chaotic, and it will throw off your readings.
Keep up the good job.
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