Yeah thats the issue, somehow I haven't managed to do so yet (HDD not recognised/booting on A600GS and stuff like that). Eagerly waiting for A600GS to have ability to setup/create own hdd, so I can buildup the Amiga OS from scratch from the A600GS itself.
You can do this already. There is no need for a hard disk file, use the Drawer based virtual drives, (like SystemV46 uses) they are faster more flexible (they can grow as big as needed, up size of sd card) and have other benefits. Hard disk file are only useful for mass importing on existing installations.