It's mainly just adjusting them until it looks right, though there are some things that make it easier:Have the adjustment bars coming from two anchor points that are next to each other (nodes) be parallel, and the same length. Depending on the shape on the line and curves, you can then adjust the bars to get the right shape. Also the two adjustment bars should on the same side of the shape, to make adjusting and comparing the adjustment bars easier. Keeping anchor points in the middle of the shapes to a minimum helps, since it makes keeping the thickness consistent throughout the shape difficult.I still use quite a lot of the making the outline, most of the time is spent on that I guess. Just want to add that your Yukinoshita vector got me into making vectors myself, so thanks for that