This is how it fits generally with the spyder.  The extruder itself will have 2 DOF (pitch and roll ... yaw not required).  A third DOF will be vertical translation of the extruder.  Examining the geometric transform requirements to print using only these extruder DOF's.  I can use the Spyder motion to provide translation in X,Y, and Z, if and when necessary.  Higher res image and pdf file will be up on ranarchy.org soon.