11:58 PM, Thursday May 13th 2021
For this one you should lean more towards tapering so that you can blend it back more seamlessly into your original line work. The main point about applying that extra line weight to the silhouette is that you do not want to apply it to the inner corners of your box. If your extra line weight ends up frying, just leave it and move on. Your accuracy will improve with practice.
I probably forgot to ghost. It happens to everyone and it wouldn't be the first time I've been called out for forgetting to follow the steps myself. I think the thing to take away here is that everyone, even TAs will make mistakes from time to time. To the second part of your question, given time and practice you may find that you are capable of making the desired mark without all of the steps of the ghosting method. That is for many people the goal. You are welcome to experiment as part of the 50% rule to discover for yourself which steps you may or may not always need. But when you are doing the lesson homework be sure that you abide by the written material above all else. Even TAs make mistakes and it's perfectly acceptable for you to point those out and ask questions.
For the purposes of this exercise your vanishing points are arbitrary. You can reference this section which talks more about distortion and placing vanishing points. But again, for this lesson your vanishing points are arbitrary.