no, since stock factory image doesn't have root. just flash supersu or superuser in recovery once you have flashed stock

Don't forget NOT to flash userdata.img else your internal storage will be cleannnnnn

i try created adhoc in computer before but somehow android devices cannot detect the wireless so i doubt the encryption technology might get difference for both devices (most of the pc).

So i use a simple application on windows that can easily hotspot to the android devices.

try download it from http://www.mhotspot.com/