Phil Spiegel said:
Extension cables can always be used to bring the 'User Interface' connections to more convenient locations:
The one connector that can't effectively be brought to a more convenient locations is the SD card, a link for at least one 'extension' cable has been posted on the forum but it's expensive, not panel mounting, to long if anything and of unknown reliability
As the side also has the power input on it, it will be awkward to mount a R-Pi with that side brought to the edge of a case.
Looking at this photo of a production board "undergoing compliance testing" at RS: http://ow.ly/i/vs0e/original
the SD card actually protudes quite a bit from the edge of the board, so if the board is inset within the case such that the SD card slightly protudes, there should be plenty of room to get a micro-USB connector inside the case.