SBuild has no notion of a specific files structure. There are only targets which can have dependencies. The idea is, to provide higher levels of abstraction by plugins. There is currently no plugin which provides a maven-like structure.
I like the idea regarding the typelevel ecosystem. But for the next two months I have almost no time for work on SBuild or it's community. Thus, it would be a bad moment, as I could not react to questions and discussions from typelevel community.