I made Simon a little wooden toy car, it’s kind of like one of the pinewood derby cars. I cut it out from scrap 2×4 and 3d printed the wheels.
I tried using nails first, but I couldn’t find any with a good fit. Simon was getting too impatient at the store, so I bought a multi-box, but didn’t have any luck with what was in it. I ended up using some small screws instead.