I am done with mounting a secondary HDD (thanks to ifixit) and installing Windows 8 Pro 64 bit on it without a worry. Charm, charm!!
Boot Camp 5 guide prescribes all needed steps and when read and used correctly, installation must be an easy task. And all the existing apple hardwares work so good in the Windows environment too.
I am going to help out a friend of mine in doing a similar thing on his mac too. If you got specific questions, please do shoot up here and i should be able to get a reply to it (if at all).