Finally got around to upgrading my machine with limit/homing capability, GRBL 0.9, touch plate probe with quick disconnect, loc-line dust collection, cable management, limit switch filter shield, DW 660 upgrades, etc.
To get the design of the limit switch shield that was opened up for download, see it here: http://www.shapeoko.com/forum/viewtopic.php?f=7&t=3045&start=11
http://www.youtube.com/watch?v=GKAo8F4SmRk