After trying to figure out how to do this myself (i.e., have friends smarter than me figure it out) & failing, I found someone to do it right.
He installed a 2TB HDD, did some more fancy things behind the scenes & installed every emulator & ROM set known to man, as well as nearly every original Xbox game made for the system.
It will take me MONTHS to figure out what is on here, how to navigate it, etc.
I can add any games that are missing (there are some Xbox games I'd like that aren't on here) as well as any new homebrews/hacks that come out.
If you're so inclined, here's a crappy video I made for my friends to show them what's on this thing. Enjoy!