I think he just wanted to say that the benefit from using the CD might
be worth the difficulties in getting it. Nevertheless, if you can just
start over again, it might be worth trying (and be easier as you just
figured out, that you can just leave the Grub entry as is and install
again on the same partition, but don't forget to add the -s to gnumach
command line the two boots you want to run ./native-install).
If you want to try a K14 CD you might ask the guys from gnu.org.in. They
might be kind enough to send you the first CD (which should not be the
problem).
But right now I suggest just to start over. Btw.
http://www.debian.org/ports/hurd/hurd-cd has a good overview of the
steps to do, but don't forget, that steps 1 and 2 need single user mode
(for the third reboot it should not be neccessary).