The first thing I noticed once the inside frame was installed and the canopy all clecoed to it was that I could'nt operate the latches anymore.  The trigger lever came just too high and was resting against the top flange of the inside frame.  A second problem is the conflict between a canopy screw and the lever.  I therefore decided to shorten the lever.  I drilled a new 1/4" hole for the swivel a bit lower and cut the top portion.  It may also be noticed that I made sure the wire guide on top of the latch assembly does not interfere with the canopy and inside angle.

Installing the standard handle and cables was pretty straight forward.  One thing I did is to cut the 18mm-wide angle that hold the cable adjusters and cable bushing narrower.  This is to avoid conflicts with the canopy and inside frame.

One morning, after a full night of dreaming about the canopy, I saw the light and found how to easily and simplistically integrate a locking device.  I went to Rona L'Entrepôt (a major hardware store in Eastern Canada) and found exactly what I was dreaming about: a latch with a 2" lever that can be installed at a 45-degree angle.  I modified the lever to fit my installation.   That latch looks pretty good.  It has a stainless steel face and a zinc body.