Trimming a diskless distribution

[Don NetBSD <netbsd-embedded%gmx.com@localhost>]

A question similar, in spirit, to that of Cág ("Correct way to trim the
distribution?")

What's a "good" way to trim the exported filesystem for a diskless
system?  (The goal being to eventually crunchgen a local system image
and eliminate the NFS mount entirely)

To date, I've been exporting an *empty* filesystem and incrementally adding
stuff to it, based on errors detected in the process of going to singleuser...
and, likewise, proceeding on to multiuser.

Of course, late bindings are a potential SNAFU in this approach -- unless
I inherently know how to precipitate those events!