> ... a la ftp://ftp.netbsd.org/pub/pkgsrc/bootstrap-pkgsrc/
> 
> Is this documented somewhere?  I'd like to create my own and want to 
> make sure I'm getting all appropriate files in the proper directories, 
> etc.

Have a look at the pkgsrc Guide. It is at pkgsrc/doc/pkgsrc.txt (or 
pkgsrc.html) or online at   
http://www.netbsd.org/Documentation/pkgsrc/platforms.html#bootstrapping-pkgsrc 

If you have an specific questions or need assistance, please let us know.

By the way, what platform are you working on?