Quick update - I am following the initial idea with creating instances of Aurora for each main category. MAIN MENU - then OG XBOX, Xbox 360 Games, XBILG, XBLA, Prototypes, OXM Magazines Disks, Demos Homebrew, Emulators etc.
It's working GREAT, and really quick on loading. For each Aurora "Submenu" I am changing the asset files, boot screen and background graphics so it doesn't "look" like Aurora. Fairly easy, just taking time to find good graphics.
When I put all the content in one instance of aurora, the coverart data folder would limit at 4096 due to the folder limitations and initial boot took a long time! This method/idea fixes those issues. Eventually I'll post pics, instructions and the files so others can benefit.