There is the man page hier(7), which describes the directory layout of a running NetBSD system.
 To make it easier for beginners to find things inside kernel source (sys, src/sys), an equivalent document for the NetBSD kernel source would be required.

Even if you're not fond with mdoc, researching this and gathering the information (e.g. in plain ASCII or markdown) would be a great benefit, and somebody who likes mdoc can then convert it to a system manpage.

You can find prior art at http://www.google-melange.com/gci/task/view/google/gci2012/7980211

 

Note that report for this task should include locations of automatically and semi-automatically generated databases (e.g. lists of USB devices).