I think we may be using different language
Several of us are referring to your run -- which is what I would call the tall framed chicken wire enclosure with sloping roof and tarp. Is that what you are referring to as "I bought a fully reinforced "fortress" enclosed coup"?
If that is their coop, I think it is too open and exposed. My coop is constructed with reinforced chicken wire attached to metal rods, but I have a tarp that covers all of that. It is permanently over and stays down one side. But in the warmer drier months [that would be from now in normal years but this is not normal and is too wet] I double the tarp on one side, back on itself to let light and air in. Both ends, including the door end, are made from wood. If I had the moula to buy yours, I would add a white tarp down the roof and opposite side from the existing tarp, and also add a tarp on the far end, just leaving the front with door open. You might need the front side tarping in the winter if it is freezing.
I use old chest drawers for nesting boxes. One for each of the ducks. Often, there are three eggs in 1 nesting box; today there were two eggs and one little girl had obliged by laying in another box. These ducks are happy to nap in individual nesting boxes during the day, but it seems that for them egg laying is a communal activity! I just mention the drawers as a cheap option -- I collected mine from the side of the road before my neighborhood trash collection.
What is the dog crate for inside your enclosure? Is the live trap an indication that you have raccoons coming round? There is a security problem with your enclosure in that it appears that a raccoon could dig down and get under the sides and into the coop. Raccoons do that sort of thing and have tried it on my son's coop. My son's coop has hardware cloth under the full area firmly attached to the foundation of the walls, to keep raccoons out. As far as we know the raccoon has not been back since failing to get inside.
As several others have written, it looks a little on the small side as a run -- but if you don't get more ducks and they are happy healthy and enjoying life, they are safer in your run than out free ranging and getting eaten by a hawk. It's a good sized over night coop.
My last suggestion is that you do change their food. I use Purina duck food for my flock of drakes and they are happy and healthy
But for the female flock that are laying, we use layer feed which has additional calcium and, I think, protein. We cannot currently get organic duck layer feed -- which is what my son prefers -- at our local Tractor Supplies, and so they are currently eating chicken layer feed, to which we add a tablespoon of brewer's yeast per cup of granules. The link is to the best value source of brewers' yeast we have found.
https://smile.amazon.com/Brewers-Ye...dfc01&pd_rd_wg=fQuz3&pd_rd_i=B00JJV3DA0&psc=1
Good luck with your ducks -- they will start laying as they settle into their new home!