Well written, thank you. I disagree when you say space is fundamental while time is not, I think they are both non-fundamental.
IMO the basic concept is an event (not necessarily motion as you seem to have). Two events may happen at the same time or one may happen after another and they may happen at the same point or they may happen separately. These are fundamental things while everything else, including space and time, are invented by man. One uses time to deal with events that happen one after another and space to classify events that do not occur at the same place.
Are space and time different? Sure. Is it 3+1 not 4? Yes. But is space any more fundamental than time? No, I don't think so. They are equally non-fundamental.