Took me more than a month, but I've finally finished it! The final page is something that I feel kinda ashamed of, the lines are just so terrible. The images are not properly ordered because the imgur app decided so.

Anyway, I often drew boxes using something different from the Y method. Let me explain my step by step:

1. Fully draw the front face and check where its convergences are. It has two.

2. Dot where the opposite face should be, checking if its edges will converge correctly with the front face's.

3. Check the last axis' convergence. If it's off, you can adjust by moving a connected pair of dots/vertices.

An alternative is to extend only one line after the first face's drawn, guiding towards the last convergence. This defines one vertex position and helps setting the last 3. I personally prefer drawing a face first and then the rest of the box over the Y method, I feel that I have more freedom doing so, more choice on how the box will look.

One thing I am well aware is that my line quality is terrible and it really shows in some boxes. They often curve and/or miss the spot. I'll be honest here, I've been slacking off on my warmups and shoulder exercises and often went just for elbow+wrist movement for some lines, with mixed results. I will commit sudoku to recover my honor stop slacking off and actually work on that.