Nice designs - I like them and would certainly consider some of those ideas in any future office fitout of mine.

However, I am unsure about those walls just inside the doorways that act as a buffer. Why not just have a door (with a glass window, the wall with the door doesn't already have a window)?

That way, the team working in the room can simply close the door when they do not want to be disturbed, or open it when they don't mind visitors. The window still lets others look in to peek at what they are doing, and the non window space on the door can still be used to put up signs, posters etc. as they would on the wall section.