After being a pretty hard core Windows NT guy I decided I'd had enough of Windows when it became dated. I vowed to do anything in my power to not use Windows again including learning Linux and line command, which I did. In 2005-6 I bought my first Mac, a mini, the 1.43ghz power pc, I eventually graduated to a Mac Pro and even as I type this, I'm doing so from a Macbook Pro...with Linux on it. Simply put, Mac is not what it used to be, there is nothing you can do on a Windows computer you can't do on OS X, that was true before OS X but now that's just not the case. However, OS X in my opinion is not where it's at so back to open source I go. If it were me, I would make a 12v box and run Mint 17 on it, that should be fairly easy to do. You could alternately install it on a Mini and run it via a small inverter. I've thought of doing just what you are doing many time but in the end, I just feel there are much better options.