Is it a good idea to run freenas 8 (inside virtualbox) on a lamp server?

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http://unix.stackexchange.com – I am redesigning my home network setup (specifically my nas and server), and recently asked a question about running a lamp server and freenas 8 on two separate machines. However, in the spirit of conserving money and electricity, i am thinking of combining the two machines using virtualbox. This way, i could run freenas 8 in a virtualbox on my lamp server (on a single machine). To prevent any conflicts between the two OS's I thought i could install both the lamp server and freenas 8 on a single usb-drive (connected to an internal usb header), and have a couple of hd's that only freenas acce (HowTos)