Finished the initial design for the XBox 360 controller mod for The Controller Project contest.  Source files and instructions listed at Thingiverse:  http://www.thingiverse.com/thing:157222

This is sturdy and functional and can be printed on a 6 x 6 printer bed.

Will post assembly and demo video later.  Any suggestions for improvement will be acted upon!  Especially if you are using this thing.