> Since when did “scratch-built” become equivalent to “built from scratch”? As a non-native English speaker, do I need some more English classes? As a native E

> Since when did “scratch-built” become equivalent to “built from scratch”? As a non-native English speaker, do I need some more English classes? As a native English Speaker, "scratch-built" is definitely not a common term (I was confused when I read this).