"Surprisingly, the electronic home button switch is attached directly to the home button itself."
That would make it, the home button, very easy to replace in the event of failure; rather than having to change something on the logic board.
On other guides you state the height of the HD that can be supported, e.g. MacBook Pro 15" Core 2 Duo Model A1211 Hard Drive Replacement , I have read ( but have not confirmed ) that the uni-body MacBook Pro can be fitted with the 750GB and 1TB 12mm drive from Western Digital.
Can you confirm this?
Many thanks in advance.