However, the cabinet is very stupidly designed. In order to just screw a hdd, had to remove the entire front cover and the metal casing and even removing them wasn't that easy either.
This is the same case for my zebronics genesis slim cabinet . I would say its more or less photo copy of the one you posted. Probably sourced from the same design

Can any one tell me which is the best way to set up a direct boot for xbmc?
HOW-TO:Make Windows boot directly to XBMC (as a shell) - Kodi follow point 1 and 2 only of the group policy editor option.
Congrats for the setup