I would say that the transom could be the same material with the same pattern, it could be the same shape with a single lite (which would be transitional really but that's ok) or it could be rectangular with upright rectangular divided lites. The mirror idea, to me anyway, is only effective if you are doing it where you actually Couldn't or Wouldn't Want to have real windows. I think the important thing to maintain with the number of openings that are adjacent here (5?), and the number of doors to be used here (5-6?) is some sort of consistency or logic behind the choices. I think if you don't have a leaded surround right at the front, you probably should not do it on the inner doors because it adds another material. Likewise the solid doors should have some kind of pattern relationship with the other solid doors, and the doors with glazing should have some kind of pattern relationship with the other glazed doors...and ideally they should have a relationship with each other as well.

I have a number of 8 foot doors with single latches. Only the french door is a significant problem - they are solid wood entry doors and the sealing is not perfect although there is no warping after 3 years. Triple is definitely better but you don't have too....We have them at a house in high wind areas and they are great. That area requires triple latch on all doors with glass I think - we have it on a glass 6'8" door (as well as a 8 ft door) but not a solid one. Anyway - they seal great and the security is amazing. Imaging kicking in a door with triple point latches into a steel frame.... Style is one thing - air sealing, longevity and security are another. I honestly think I would do triple point on any exterior door if money wasn't an issue.

Perhaps, in lieu of pendants, something like this: https://www.homedepot.com/p/Kenroy-Home-Corbis-4-Light-Bronze-Island-Light-93595ORB/300513035?cm_mmc=Shopping%7CG%7CBase%7CD27L%7CMulti%7CNA%7CPLA%7CInteriorLighting%7c71700000038836110%7c58700004241533705%7c92700035280099904&gclid=EAIaIQobChMIy96Bk8Dw3gIVjf_jBx0DyAHHEAQYBCABEgLtmfD_BwE&gclsrc=aw.ds

Funny the first pic made the light look soo off center. Anyways. You definitely should make a template on the floor and see. I love the style choice of The table you like. Really pretty. And I love how the room looks so far.