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I would make sure you check up on the cable you're buying if you aren't going to build it. VAG-COM uses a system to connect to the CANBUS in the car, where as in the BMW there's actually a DHCP server in the car which assigns your laptop an IP using the ethernet cable. The software communicates with the car through TCP/IP instead of a USB data connection so it's totally different. The VAG-COM cable has some circuitry and intelligence to establish this connection, where the BMW cable is just a passthrough cable that connects some of the pins to the ethernet pins.
At the very least I wouldn't just buy an OBD to ethernet cable as it may be totally different. Ask for a wiring diagram from the seller and make sure the wires are connected to the right pins and it has the proper resistor as well.
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