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.
Maybe this video could be of help? It is about setting it up on A1200NG, but should be more or less the same for the A600GS.
https://www.youtube.com/watch?v=x5FIe7AybWs