Things we did right:
I would heartily recommend a monitor roof for anyone in a hot climate. With the pop door open 24/7 except in dire emergencies and the coop located in deep shade it was never any warmer inside than the ambient air temperature outside and, as previously noted, no rain ever penetrated beyond the roof overhangs.
Nor was it hard to build for a competent handyman.
The structure is entirely sound, due to DH's family habit of over-engineering everything -- though it can be moved by 4 men with the carrying 2x4's in place (we knew we'd be moving to the country eventually). The skids need to be replaced, but that can be accomplished by putting it on blocks during the process.
It *is* portable, though not so light as to be moved without serious effort.
The nest boxes were a good size even for the Brahmas.
The roost was well-placed, above the nest boxes but below the open section of the roof.
The hardware cloth defeated the efforts of a predator -- unable to tear the wire loose it attempted to rip through and failed (we added a second layer over the entire area that was damaged).
It was not difficult to clean out since the large door allowed me to reach all portions of the coop with the manure fork even though I am too short to quite reach the far wall. When the residents retired the man helping me relocate them to the freezer was easily able to reach in and get hold of them without a rodeo. (I would not make a non-walk-in coop any deeper).
The far half of the run was roofed, so that I could keep the food and water out of the coop. The chickens were able to bask in the morning sun and had to get out of the coop for exercise in all weathers. (In a sunnier location the entire run should be roofed.
We had a perch in the run, which was regularly used.
Things we did wrong:
That OSB wall. Never again.
Not using treated lumber for the ground-contact areas. DH was concerned about the effects of the preservatives used on the chickens' health. Better information about the modern wood treatments that replaced CCA wood has assured us that we can use it next time.
Too many nestboxes. The renovation will reduce them to two. We will replace the rightmost box with an additional vent window because in our new situation we will not be able to create a hardened run with 24/7 access right away. This vent will be under a roof overhang and have a cover that can be lowered during hurricanes and in our rare, truly cold weather.
4-foot run height. All future runs will be walk-in.
Use of inexpensive roofing materials. All future coop roofs will either be metal or will be constructed exactly as if they were on our own house. There's no savings in having to replace stuff.
Fit of pop door tracks too tight. DH's over-engineering strikes again. He had forgotten the warping effect of exposure to sun and moisture. (Funny thing, our oldest son is converting his carport to a bedroom and made the same error when cutting his floor joists -- making precise cuts then having to hammer them into place or trim them).
Roofed section of the run not slanted. Rain puddled on top, accelerating the deterioration of the inexpensive roofing materials.
The coop perch was only held by gravity and not otherwise secured because I thought that would make it easier to clean. The big Brahmas, particularly the rooster, periodically knocked it down. I liked the natural branch and the ability to remove it for cleaning but I have to figure out a means of securing it until I want it loose.
). In theory I only had to alter two near the door but I couldn't have lived with that so had to cut 24 rafters to match 
