Virtualbox within a truecrypt volume

hey,

I'm trying to set up an encrypted virtual machine. I created a 15GB encrypted file with truecrypt, and then opened Virtualbox and made a new installation of xp inside this truecrypt volume. Actually the only thing inside the encrypted volume is the boot hard disk .vdi file. Is this now a totally encrypted OS? Are there any other parts of the guest os that might leak into my host os?

I know truecrypt can encrypt an entire harddrive and require a password on bootup, but that isn't really possible for me as i'm running bootcamp win7 on a mac. Thanks for any advice.