guys, correct me if im wrong but, as long as you can successfully get to the boot loader, you can go to town on your device, if you mess up the OS, rinse / repeat with an different rom you cooked up with the kitchen ... at least that what I did to learn how easy it was
I've just started getting serious with modding my 6700 and the only thing I needed to worry about was the radio and boot loader ... everything else is fair game for possible modding destruction so to speak.