It wasn't a VirtualBox limitation, but an OS X... I know that VMWare won't let me create a VM of 10.6 unless it is from 10.6 Server install media.

Building a hackintosh—that is, installing Mac OS X on non-Apple hardware—used to require extremely restricted hardware choices and quite a bit of know ...

How to install the virtual machine Open VirtualBox and choose Machine/New then choose a name for the virtual machine. For our installation, we will call it QubesOS-vm.