Hah, that is indeed something I hear often, and while it definitely results in a considerable size restriction, those master ellipse templates are still the best choice (in terms of cost efficiency) for this challenge. It's not at all a problem that the wheels are oriented in the same way.

Starting with the structural aspect of the challenge, you've done an excellent job overall, with just one minor concern to call out. I'm pleased to see that you've been mindful of not only defining structures like the rims/spokes by their outward faces, but also have paid attention to the need to define their side planes in order to ensure the forms feel solid and three dimensional. When doing so however, it's important to keep in mind how these different forms meet - when defining those side planes, I did notice cases where you would extend the farther edge of the side plane too far, beyond where it would logically meet the outer cylinder of the rim structure itself, as shown here.

Continuing onto the textural aspect of the challenge, in that area this challenge is meant to be something of a trap. It's pretty common for students, being as far removed from Lesson 2's textural concepts as we are, to forget about those principles - specifically those relating to using implicit markmaking employing cast shadows rather than using more explicit markmaking such as outlining and employing constructional approaches to defining each and every textural form.

While in your work you are definitely attempting to employ implicit markmaking and relying on filled areas of solid black, what I'm noticing - most obviously in the tire treads that involve "chunkier" textural forms - is that rather than drawing the shadows those forms cast, you're filling in the side planes of those textural forms rather than drawing the shadows they cast on the surfaces around them. We can see this in 22 and 23 on this page, for example.

Always remember that a cast shadow is a new shape that is designed specifically to capture the relationship between the form casting the shadow, and the surface receiving it. The shape itself must be designed anew in most cases, so if you catch yourself filling in an existing shape (which is a temptation we often encounter), take a step back and ask yourself whether you're just filling in that side plane - which is more akin to form shading, which we do not employ in our drawings for this course as explained here - instead.

I am of course still going to be marking this challenge as complete, but be sure to review the textural material before moving forwards, and pay special attention to the reminders listed here.