Alrighty! Your actual object constructions are very well done, and I'll touch upon them in a little bit. First however, your form intersections - which admittedly are easily the most complicated interaction between forms we ever encounter, far more complicated than the kinds of things we deal with when actually drawing normal objects, do have some key issues.

You're doing a great job in drawing the forms themselves to be consistent and cohesive, but the actual intersections themselves - especially those involving rounded forms - have some key issues. Take a look at these redline notes I've drawn on your first page.

• I'm seeing a pretty frequent tendency to draw draw a shallower contour line along the surface of a rounded form when defining its intersection with another object. This tends to flatten out that form.

• Towards the upper right, your far ellipse is definitely narrower than the end closer to the viewer. I actually pushed it way too far in my correction, but you get the idea. It should be wider there.

• In a couple spots - the sphere intersecting with the box in the upper left, and the cylinder intersecting with the lower box - you definitely need to think more on exactly what the intersection line itself is. It is a line that runs along the surface of both forms simultaneously. So if you were to pick any singular point along the l ine, you should be able to ask yourself, "is this point sitting on my first form? Is it sitting on my second form?" If ever the answer is no - which is a common problem, having it run on just one form at certain places - then that intersection line was not correct.

For this last point, a good example is the sphere intersecting with the box. You had drawn a straight line cutting down along the side of the box, so the whole of the intersection line was absolutely sitting on the box's surface. But the line ended up sitting inside the sphere, except for the single point sitting along the edge of the box.

Anyway, looking at your actual object constructions, your work here was fantastic. You demonstrated a great deal of patience and care in subdividing boxes and laying out all the structure, scaffolding and information that was required to tackle the details that were required. All of your cylinders and rounded corners were well supported by straighter frameworks, and you didn't let yourself fall to much guesswork or estimation.

One area that can always see improvement is with the outer enclosing boxes - they serve as the starting point for most constructions, so if and when they're a little off, that issue can ripple through the rest of our construction. That said, even when that was the case, you did an excellent job of simply sticking to the construction that was being laid out, rather than going well out of your way to fix the issue. I can see in the case of the speaker where you did cut a piece off the back of the box, but the way you approached it was still within constructional constraints, and respected how everything sat in 3D space.

All in all, you're doing a great job. I'll go ahead and mark this lesson as complete, so keep up the good work.