Caleb, I've run implement steering since 2007, first with Trimble's FMD and two 252 receivers.  When the FmX came out in 2009 I switched to this setup---FmX with both receivers unlocked, two Nav IIs, that will get you steering with both the tractor and implement.  I control an Orthman TrueTracker both on the planter and strip till rig, this is on contour and terraces as well as straight rows, strip 8 row and plant 16 row.  The FmX steers the tractor, steers the planter, runs the VR seed, monitors the seed, and runs the clutches.  With the second receiver unlock you get another globe to place on the implement.

As far as the Intergra, you can send NMEA out of the Nav II in the tractor to the Integra and run all the functions that you want through the Integra.