I can happily say that while I can't say whether or not the 6 month gap hurt your skills, it certainly didn't hurt your attention to the instructions. As a whole you've done a great job throughout this lesson, although I do have a couple quick points to call out, just to help you continue to get the most out of these exercises.

So! Starting with the form intersections, you're doing an excellent job here of demonstrating a strong understanding of how these various forms sit together in 3D space. Your intersection lines remain firmly on the surface of all relevant forms, and I'm not seeing any standout cases where they follow one too much, to the detriment of the other. Similarly, your cylinders in boxes are coming along really well - despite the break, you're still applying all of the error checking effectively, and while there's certainly still plenty of room for those lines to converge even more consistently, that is entirely expected (and would be the same for me if I were to do the exercise right now). What's important here is that the exercises are being applied correctly, and that gives you a clear path to continued growth.

Continuing onto your "form intersection vehicles", you've made good use of this exercise and successfully focused on what I intended when assigning it - a lot of students get a little psyched out and push them much farther than what I intend, but really I'm just asking for the form intersections again, but with the primitive forms arranged in such a way that they create the impression of a particular vehicle. Technically worrying about proportion/spacing/etc did push this further than I intended, but you were still fairly light on that, and as a whole it didn't overshadow the focus of the exercise - to get used to the idea of working from simple primitives and refining them as you go.

I especially liked the simple vespa construction, though I can see that the larger cylinder along the top was oriented incorrectly - though perhaps this was intentional? Your minor axis is definitely diverging dramatically from the left vanishing point..... actually I just realized that this was supposed to be the headlight, and thus aligned to the right vanishing point. Still a little off (and I'm now realizing that the marks you put down around there suggest that you did understand this). It's perfectly normal to end up with little hiccups like this, and you were right to simply leave it be. That said, one way in which this can be improved is to leverage the use of your ruler - you can think of it like a way to see in what direction the line segment you want to draw will converge, but without actually committing to it - so you can ostensibly use it to help you get those convergences to line up a little more consistently.

Before I continue, I wanted to make a quick note of the fact that you didn't use an ellipse guide here. Ellipse guides are definitely a tricky situation - one we hope to rectify, at least partially, once I can get Sven a laser cutter so he can experiment with producing them himself, then selling them cheap as we do the pens. For most students, a more limited master ellipse template is sufficient both for the wheels and for the ellipses we use here to establish a unit grid. In your case, it looks like you didn't have one to use, but honestly where most students do end up deviating more considerably when forced to freehand ellipses for this, you remained fairly controlled and consistent in their use. I wanted to make note of this because it shows that your control and comfort with ellipses has developed very nicely.

Moving onto your more detailed vehicle constructions, these are all generally quite well done. You've been quite meticulous throughout most of your construction, and while there are a few things I'm going to note below, as a whole I'm very pleased with your work.

• The first thing I noticed is more of a one-off mistake - the sort I don't generally hold against the student unless it becomes a pattern visible across multiple drawings. In your Bobcat Excavator, the way the treads have been drawn makes them appear very, very thin, largely because the form itself has no defined side plane. It's more of a very flat piece of ribber stretched across the wheels/driving gears, but with no thickness to itself. Always be sure to define everything with some sort of a side plane, unless you have a specific reason not to (like when drawing things that are literally paper-thin).

• In that same excavator, and in some earlier examples, you do a great job of approaching your rounded corners by first blocking them out with straight lines, then rounding them out towards the end. This is admittedly missing in the cab of your Ford Mustang, and I believe the reason is that it's not so much a rounded corner, as it is a flowing, curved surface. But, as explained here in Lesson 6, we still need to capture these as a chain of straight edges first, as these allow us to create more sound, specific structures, before rounding it out.

• There definitely are some observational discrepancies between your ford mustang and its reference - mainly towards the front/grill. Cars are by their very nature, a lot more complex than basically everything else we look at in this course, simply due to their organic, and highly specifically designed nature. Every element of it is crafted with intent, and it all comes together to create the impression of the car. When certain things are misaligned, misplaced, or forgotten, it does undermine that impression. I'm not actually concerned about this in your work - it's something you'll get better at with practice - but I did want to point it out. So for example, we can take a look at these marks I've drawn over your reference (sorry for their clumsiness, I'm in a mall trying to get critiques done on an iPad while Scylla finishes up at the doctor/pharmacy). The blue edges all sit at the same height, so the top of the headlights should be in line with the top of the front cut-out. And in green, I've just highlighted those major structural cutouts that are integral to the design of this vehicle.

Anyway! All in all, fantastic work. I'll go ahead and mark this lesson, and the course as a whole, as complete. Congratulations!