Just to keep you informed, we have made big steps forward in understanding the way the cameras work at the lowest level.
With just a bit of "magic powder", a large part of the D5100 firmware startup code now runs in NikonEmulator and displays the classic info screen.
A short video of the rendering is here: http://www.youtube.com/embed/wXVybNZOR70
(I slowed down at two places so you can see the individual pixels being drawn)
There's more work ahead obviously, mainly getting rid of the "magic powder", but that's an achievement we wanted to share with you.
The NikonHacker core developers