You may not be intending to suggest anything, however your posts and the way that you ask the questions make it seem as if you think that they are not doing all that they can do to produce the Model 3 on time. Things like this statement:
It's a construction site, for a variety of reasons they do not move quickly on construction sites. There are safety issues, quailty issues, planning resource management issues, and many more. So you will never see workers running around slinging beams and girders all about or pumping concrete like it's coming out of super charger. Everything has it's pace, I'd much prefer that they take their time, do it right, and not delay things with accidents or other haste induced problems. What may look laid back or too casual to you may in fact be break-neck speed.
I understand asking the questions and wanting to know what the answers were. I wanted to know why it would take a year and half from the reveal to getting productions started. I read the answers here and did some research - problem solved. This thread has over 17 pages and (now) 332 responses, and the same questions are still being asked, maybe slightly differently but still asked. The fact that the thread hasn't died really implies that you and maybe some others really think that they could be moving faster.