Here are a couple of recent illustrations. One is a creative cross section, the other is a realistic or scientific cross section.
I chose a nautilus because they are a bit like submarines (they can control their depth) and you often see cross sections of submarines. I am proud of the command centre & control room that features a brain in a jar.
For the McDonalds meal, I just had to complete something, so I thought it would be fun to cut something that is not normally cut.