An idea occurs to me that with nimble fingers, a thinner board, and a glue gun with a fine tip you could use a similar method for "copper" tubing on the cheap for Steampunk stuff. Or anything that requires attractive-but-non-functional "flexible" tubing , really. Or, if one was horribly clever, they could run flexline for air tubing through it for something... The possibilities are nicely endless.
Not my intention to hijack your tutorial, it's lovely on its own, it's just given me an idea of how to create more than just horns using the same general method. I'll need to try it later.