Default [Q] [i9001] is dualbot with factory rom possible?

Hi
I have an i9001 with rooted factory rom and installed busybox

PDA: I9001XXKPG
PHONE/MODEM: I9001XXKPF
CSC: I9001TPLKP2
Build Info: Mon Sep 26 10:28:55 KST 2011

Is it possible to use dualbot from this thread http://forum.xda-developers.com/show....php?t=2462783 with factory rom or do i need to first flash custom rom like CM?