Hi All,
After reading this forum and working out what works and doesn't. I wrote a complete post about my configuration.. its an all in one NAS/Home Lab/Mame/game setup. http://rammstyletech.blogspot.com.au/2013/02/all-in-one-vm-lab-nas-mame-arcade-media.html its a bit of a read but anyone wanting to do the same it should be helpful.
Thanks for everyones input here so I could make this a reality..
cheers..