How do I dimension these two planes in 3D space in reference to the coordinate system.

How do I dimension these two planes in 3D space in reference to the coordinate system shown.  I will need to do the same for approximately hundred additional scans and compile/average the results.  Then convey the average position and angle in a means that the planes can be recreated to provide sketch planes for profile sections of future part files.

SolidworksDrawings And Detailing