https://global.honda/content/dam/site/global-en/topics-new/c...
https://global.honda/content/dam/site/global-en/topics-new/c...
But an impressively smooth landing regardless, and I would imagine maybe harder the smaller the rocket is.
You likely weren't being exhaustive in your listing, but I first started watching aerospace development with Armadillo Aerospace, and some of their rockets were much smaller. Their largest one was still shorter than the dc-x.
Its dimensions according to Wikipedia:
Height – 31 feet (9.54 meters)
Weight – 2.9 tons (2.6 metric tons)
Diameter – 20 inches (52 centimeters)
Payload to Low-Earth Orbit – ~9 lbs (4 kg)
Pretty sure that, or some other hobbyist project, is going to take the prize for "smallest".
I doubt that this rocket has an engine intended for orbit? So it makes me wonder how serious this program is.