Congrats on completing drawabox! I'll do my best to give you feedback so that you can improve!

Starting with your form intersections you seem to be doing very well here aside from a minor mistake I noticed here, you're demonstrating a very well developing understanding of how the forms at play here relate to one another in 3D space, and the manner in which you're leveraging those intersection lines - piecing them together from sections each defined by the different surfaces that are interacting with one another - demonstrates this very clearly. It's to the point that this diagram which I often share at this stage, is probably of no use to you, as I can clearly see your understanding of it in your work. In case you wanted to deepen your understanding take a look at this form intersection pack made by optimus on discord.

Moving on to your boxed cylinders, you are applying the error checking method correctly. The only advice I can offer here is to increase the confidence of your lines as some of them seem to be wobbling. You can do this by ghosting and drawing from the shoulder.

Finally for your vehicle constructions you've done very well here building up each vehicle one line at a time demonstrating a lot of patience and care to the process. I will address some points which can help you improve more.

• Firstly, I would include proportional studies / orthographic plans for each construction. By doing an o.plan before constructing in 3d you take the decision making process out of the 3D construction (as you're drawing it) and move it to before you actually construct it. This allows you to focus fully on thinking in 3D space as you are drawing the construction. I can see you've done this for page 3, 4 and 6 which I assume are the vehicle form intersections. Additionally when you do this for other vehicles, make sure you break down each part so that it can easily be replicated onto the 3D construction. It would look something like this if we take your helicopter o.plan for example I've added subdividing lines which tell me the exact height of the door so that I can easily replicate that onto the construction when I draw it. You would do this for every part you wish to identify. Furthermore you should always try to contain the whole vehicle inside the o.plan you draw instead of drawing the o.plan and then artificially extending the plan to fit an extra bit you didn't account for.

• Secondly, make sure you define curves as straight lines before drawing them as curves. It helps a great deal to treat all your curves as though they're simplified down into a chain of flat lines or surfaces, effectively leaving the curving aspect out of it entirely. Some shallower curves can be represented with one line/flat plane (like the windshield), whereas others might need to be broken up into a couple or more (like the rear window). This way we can build our construction more solidly first, then round them out later.

• You'll also notice that as a result of breaking the curves down into straighter chains, we end up with some clearer landmarks which we can then position at specific points along the length of a given dimension - so for example, we know that the very top of the windshield, where it meets the roof of the car, is positioned right at the 1/2 way mark along the length of the car. You did identify these landmarks for most such major points, which is great because it means that they can then be transferred to your 3D structure - but I would strongly recommend actually placing those landmarks by using the diagonal subdivision technique. Reason being, if the process we use in our 2D orthographic plans is the same we use when transferring it to 3D, there's less chance for information to be lost in translation. It becomes a matter of simply repeating the same process.

• Finally areas of solid black should be only reserved for cast shadows only. There are areas where you do this and others which read more like form shading which is to be avoided in this course. Cast shadows require us (at least in most cases) to design a new shape, one that defines the relationship between the form casting the shadow and the surface receiving it.

And that's pretty much it! Don't hesitate to ask questions if you have any or if anything was unclear. Congrats on finishing drawabox!