I don't think you are an 'Engineer'.
Just your original denial of a 'Roman Arch' working under a compressive load was a Red Flag and gave you away.
Every Architect, Engineer, Designer, Craftsman, WANTS feedback of their Work. It is their Lifeblood.
You don't want any feed back. 'Engineers' NEVER do that.
You casually dismiss a 'possible hazard' as "It's only a problem for shorty guys and invalids, and neither is invited into my home." Real Engineers know their 'art' will outlast them. That home will be there for the next 100 years.
Now, to your credit, you did mention an exterior element that you brought into your home that was part of the window treatment. But ... I think you said that was your wife's idea, so ... I don't think that counts.
Hey, no biggie. It's an anonymous Chatroom, you can be anything you want. (Overall, the House looks great, you have a nice Home)