1) I tried that, at first. But still two problems: One, a lack of space between machines to visually see how hey become connected (or fail to connect), and Two, landscape is not flat and eventually I can no longer place blocks in a straight line. I had limited success by occasionally moving up one block. Perhaps make a new block that is simply a spacer/aligner (and 'free')?
2) I played with some of that, as well. It works well enough for fully automatic lines. But lack of an ability to manually shut a machine off for other purposes is still a problem. And makes little sense. Imagine a light in your house that once placed will turn on at dusk and cannot be turned off until dawn. You have to remove it to stop it. Eventually, you will get frustrated doing that and just go buy a light with an on/off switch from some other company. (In truth, is is the main reason I stopped even trying this game. too frustrating, for no reason.)
3) That is indeeed helpful. Trying now to just figure out which video is which.