Starting with your form intersections, you're doing a pretty good job but I am noticing some issues with how you handle the intersections involving cylinders. As shown here, most of your intersections show a good grasp of these spatial relationships between forms, but the cylinders tend to be the main mistakes. There's also an issue with this one (I added a little cast shadow to better demonstrate the relationship between the forms - it seems like you misunderstood which end was farther from the viewer and which was closer.

Now, aside from this, and your self-professed disappointment, your work is actually pretty stellar throughout this set. The fact that you can't get your hands on ellipse guides is regrettable (they're not generally that easy to get locally, so most people rely on ordering them online - specifically people get the 'master' templates which are more limited in size options, but also much cheaper). Despite that, you've actually worked with that limitation very well, and while your ellipses aren't perfect (they're not expected to be) they are at least here entirely workable. I can't speak to whether it'll be more difficult in the 25 wheel challenge, but I suppose we'll find out.

The important thing here is that you've approached these constructions with a great deal of patience and care, subdividing everything as much as was required to position things in specific ways, and not being afraid to push it farther in order to get a deeper level of specificity. Some students will subdivide to a point, and then estimate things beyond that (certainly not something I'm encouraging, but it isn't uncommon for students at this stage). They usually come to appreciate the importance of pushing their subdivision farther as they hit lesson 7, but you're already showing a great deal of care and patience here.

Your use of line weight is also very effective in pulling your drawings out of those subdivision forests, but without being overdone, or using tracing of the lines in ways that add stiffness or wobbling. Your forms remain solid and believably three dimensional throughout the entire process.

I really don't have any complaints - I have a few tiny nitpicks I can offer, but they're negligible in their importance. For example, one would be with the directional buttons on this nintendo switch, where you placed them within the different triangles of that subdivided face. When placing a circle on a surface, it's always best to do so within a square - triangles don't work too well for this, and so they end up with slightly less precise locations.

A second nitpick would be along the top of this trophy, I noticed that just underneath the top piece, the ellipses weren't drawn particularly well there - or more specifically, not enough ellipses were included to define the complexity of that form, as shown here. As a whole that was probably the only construction I'd have considered to be particularly weak.

Aside from that, your work is coming along great. I'll go ahead and mark this lesson as complete.