Posted for "George Braly" <gwbraly@gami.com>:

 That would be nice...  but if the plenum fits the cowl, nicely, why not use
the cowl to seal the whole thing, instead of the extra weight of the "plenum".
 
 Regards,  George
 

"""
 One day you will be blessed with the opportunity to work on a plenumed
 engine installation that has:
 1. clean, correctly sized inlets sealed to
 2. nice curved wall diffusers sealed to
 3. a large volume (near net fit to cowl) plenum with
 4. a  five minute removal time.
 They do exist.  Perhaps they are few and far between, but they do
 exist.
"""