Congratulations on getting through these--this challenge is tough.

It does look like you struggled at first getting a variety of sizes, aspect ratios, and rotations, but you do cover a variety eventually.

The degree of the farther ellipses is generally higher than the degree of the closer ones, so you clearly understand how this works. You align your ellipses to the cylinder axis well. Your "checking lines" look good, for both the plain cylinders and cylinders in boxes.

Overall, really nice work!