Well, as you are using original snapshot, you'll need some more packages rather than kernel. At least a number of these:
http://repo.merproject.org/obs/nemo:...atest_armv7hl/
http://repo.merproject.org/obs/nemo:...atest_armv7hl/

The shutdown (if the phone is completely powered off) is almost certainly because of watchdog, which someone (dsme daemon) should kick regularly.

It might be helpful if you compare the contents of your image with the one of working N9 images (preferably, the same 1.0.5 version).