A kind soul pointed out I had my ELF header constructed slightly
wrong. The following part of the first note in the .note.netbsd.ident
section should have the following either removed or commented out (it
was commented out in my local copy here):

        db      "netbsd",0x00,0x00
                                ; desc part. :)

This is somewhat illegal in our instance since we already have the OS
version--and that's all that part of the note provides for. The second
case of the "netbsd",0x00,0x00 is perfectly okay--since it describes
the emulation to be used for this binary.

..Marc