You're most welcome! To answer your question about the treasure chest challenge, while generally sticking to the format of a regular chest is best for the majority of them, students have included some that held more loosely to the idea of "container with a lid", and that's been fine. Just... don't go as far as DIO. I think he did a toilet for one of them. Those do not contain treasure, I checked.

Jumping in with your form intersections, overall your work here is coming along decently, although there are a few things I want to draw your attention to:

• You've got somewhat inconsistent rates of foreshortening here, between your different cylinders, the boxes, etc. Part of it is just the differences in scale, for this exercise it's generally recommended that you keep them more similar and avoid dramatic differences, but some of it comes down to not necessarily being mindful of where you're applying more foreshortening and where you're applying less. For example, this cylinder to the right. Foreshortening is a visual cue to tell us how much of the length of the form in that dimension exists in the unseen dimension of depth. Thus by adding more dramatic foreshortening there, you're telling us that cylinder is actually much longer than we see on the page, but with all the other forms at play, it's easy to end up with contradictions.

• One important point to keep in mind that when an intersection line crosses an edge, and goes from one face to another at a different orientation as we see here, that means that intersection line is going to have a sharp corner, not a gradual transition. You can see this demonstrated conceptually here in this diagram I shared with you back in Lesson 6's critique.

Continuing onto your cylinders in boxes, generally solid work. Mainly I'm looking for whether or not you're applying the line extensions/error analysis correctly, and you appear to be doing that well. I noticed that you did multiple pages, and even mentioned an intent to do 5. It's a bit of a moot point given that this is the last lesson, but doing more than what's assigned is a pretty significant no-no in this course.

Moving onto the form intersection vehicles, your work here is good, although you've somewhat overshot what was really being asked. As mentioned here, we're really just asking for the same thing as the form intersections exercise, but with the forms arranged in the layout of a vehicle. No worries about proportions or applying the construction-to-scale approach, just laying down primitive forms. Going beyond that isn't really a big deal, but my main goal here was to get students comfortable with the idea of these vehicles still being made up of primitive forms - so when we move onto the more detailed constructions that we do build inside of bounding boxes, and whilst paying more attention to proportions, we still approach them with a mind for the individual forms being laid out inside of the grids.

Now continuing onto your detailed vehicle constructions is where what you've learned and how your skills have developed has really shined through. You're demonstrating an exceptional level of patience and care, and have really shown the capacity to take your time with these constructions. And of course, they really demand it - but you didn't cut corners (except a couple points I'll mention in a moment), you largely met the challenge and what it demanded of you. I'm also pleased to see that you built up your orthographic studies by using subdivision to identify the positioning of your major landmarks, to help make many of those decisions before actually building up the 3D construction. There are definitely landmarks that could have been identified that weren't, but most were minor. The more decisions we can make ahead of time the better, but at the end of the day, it's not a matter of correct/incorrect. It's a matter of rolling with the process and seeing where it takes you.

The only complaint I really have to offer is that there are some small places where it looks like you shifted your gears so to speak, and broke away from the mindset where you were continually aware of all the forms you were working with, and shifted more towards a looser attempt at adding little bits of detail, or other decorative marks. You didn't do this too much, but there were some instances - such as here on your steam roller, here on your benz roadster, and even this arbitrary hatching on the same roadster (which you can read more about here back in Lesson 2).

I certainly understand why you ended up going this way, but in each of these circumstances due to the significant change in approach (and the visual clash it results in), it would be better not to add those details, than to add them after you've hit your limit of how much time you're really willing to put into the construction.

Aside from that, great work. I'll go ahead and mark this challenge, and the course as a whole, as complete. Congratulations!