This one was done in advance (I have to take/coach kids to speech contest tomorrow, out of town, but I was intrigued by this style, so even though I did two sketches in a day (a busy day!) I couldn’t finish out the week without it.
I used a ruler fairly consistently – for the overall shape and for the first angles, then I just took my time. That’s why the lines aren’t all as straight as they should be.
What I didn’t do was measure the inside lines accurately. They aren’t supposed to line up, like the left hand side does. The one on the right is more like what I was going for. Still, I’m pleased with my progress.