but the only mac address they would capture is the address of your router - so changing your ethernet cards mac address, as you suggest, in your 2nd link would have no effect whatsoever
also, this is NOT traceable back to you when using a google service anyway - your MAC address is only traceable by your actual ISP, or to put it more clearly "MAC address will always be in the header of the frame (Tor or not) but this is between devices on the same segment, as a packet moves from device to device the MAC address field changes. IP addressing is what is used for packets to navigate the internet not MAC addressing.".
i.e. do a traceroute from your pc to google.com : it passes through several connections, all network interfaces in each step will have their own MAC address and only the last one is technically "seen" by the destination.
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