Looks cool to me... But I myself actually had some problems gettin' the Xbox to boot the last part (the OEM BIOS) --> yes, I've got a MultiBIOS myself

. But as long as the first 3 "slots" are filled with the hacked BIOS it shouldn't ruin your Xbox, IF you can't (like I couldn't) bootup the OEM.. So go ahead, and try it out...