I definitely agree that you worked really hard at this one, and it shows. You're definitely moving in the right direction, but the tricky thing about cars is just how easily mistakes (specifically in studying proportion) can snowball out of control - and sports cars with a lot of fluid curves are notorious for making this even harder.

I did a bit of a proportional analysis of your drawing, in comparison to your orthographics, and I found some notable mistakes. Here's my analysis.

The first thing I noticed - though I didn't really focus on it much - was that when transferring your "unit" grid over to the width dimension, the ellipse you worked with didn't have its contact points aligned towards the vertical vanishing point (should have been pointing straight up), so this would have thrown off your scale in that dimension.

More notably though, there were two key issues I noticed:

• Your back wheel was too far back. Stepping back from the front wheel, you've got a little short of 2.5 wheel lengths. In your drawing, however, you're taking almost 3. Before the rear wheel there should be a full wheel length, but you cut it pretty short. This suggests that you placed your back wheel too far back.

• The height of your construction was incorrect as well - looks like you've got the height set at 2.5 wheels, but looking at your orthographics it should be just 2 wheels.

These issues had a lot of significant impact on your resulting construction. Something that could have helped is to take the analysis you did of your orthographics, and then draw your own orthographics based on the proportions you'd recorded. This should help you more quickly identify any key issues or misunderstandings before you get too deep.

Now, like I said - I think you are demonstrating the appropriate attention to construction, just not so much to the earlier planning phase. Normally I'd be okay with marking this lesson as complete, given that this is the end of the course, I don't feel that I'd have quite done my duty without giving you one more swing at this.

So here's what we're going to do. You're going to do one more vehicle construction. I recommend that you stick to something a little boxier - a 60s or 70s muscle car, a 1920s model T, or one of those boxy sedans from the 1980s. The key isn't to throw something hard at you, but rather to get you accustomed to pinning those proportions down correctly, and then seeing it through to the end.