Right way to do ceiling strapping with autoframe?

[GeneDavis]

I specified my porch ceilings, which I want to finish in LP panel fixed to 1 x 3 strapping, in the FINISH part of structure, 3/4-thickness framing layer, 16" centers, 2.5" wide, above the 0.354 panel.  This is a change.  I formerly specified the ceiling finish as a single later panel, fixed directly to the truss chords above.  

 

I try autoframing the room's ceiling and do not get the strapping I expect.  What might I try next?  I've framing built everywhere else and have edited quite a bit, so I only want to frame these ceilings.