I think you should stop thinking about boot-132...
no one on the scene has suceeded making it working with vbox.
but, again, you should start thinking about UEFI XPC Boot
for a remind, irc channel is UEFI-Boot, hosted on irc.moofspeak.net.
last news are telling this
new version is about to be released, and according to the short movie up there, the guy make ideneb work on vmware WITHOUT any modifications..."two screens from xpc gui at http://ul.to/75xzqk | xpc booting ideneb 10.5.7 on vmware http://ul.to/9xxzsa"
so there is a small hope that full efi support would help us booting osx on virtualbox.
there is more, i heard it will be able to boot snow leopard...
is it good news?