How would you draw Newman projections of alkanes?
Well, I would use a model to inform my sense of geometry....
Some people, perhaps they are professors of organic chemistry, can look at a formula, and immediately assess molecular geometry and conformational analysis. I am not one of them and would always use a model to aid my reasoning.
Given a model that represents the molecular geometry, we can always rotate around a given
Now not only do you have to make the model, but you also have to transfer that three-dimensional geometry onto the printed page in a Newmann or sawhorse projection. This is certainly non-trivial, and requires some practice.
I don't know how useful the diagram is on its own, but certainly with a model, you can use it to inform your reasoning.