I do not want write anything here that would cause you to make any specific good or bad comments about this French door design and installation, so feel free to say good things, bad things, ask questions or suggest what you would have done differently if you had been involved on day1.
Wall is standard cavity wall (1960's house)
Regarding image showing glass sticker - see this video https://drive.google.com/open?id=1XCidQjE-I78L4nRmdIJX_EUXnMfoPm_W
Note Partly painted wall around the doors is not an issue, the whole wall will be painted.
Thanks for your time
ColinK