Changing main username/home/groups

[NoOp]

I have a lucid test partion on my laptop that I was using to test sound
patches. Today I decided to do a network upgrade to maverick so that I
can test the patches with that version.

The machine name was 'lucidtest-laptop' and username/group was
'lucidtest'. To make things easier I decided to change to
'mavericktest-laptop' and 'mavericktest' respectively.  So I go hunting
around to find an easy way to change the names and group and end up
booting to Recovery mode & use root to:

# usermod -l mavericktest -m -d /home/mavericktest lucidtest
# groupmod -n lucidtest mavericktest
# nano /etc/hosts
(modify the host to reflect 'mavericktest-laptop')
# nano /etc/hostname
(ditto)

So far so good. However when I logout & log back in GDM is still showing
'lucidtest' in the user box, but also shows 'mavericktest' in the black
floating username box. I login & find that my home folder is
appropriately renamed to 'mavericktest' and ownership (owner and group)
is proper. However, the owner is showing 'mavericktest-lucidtest'. I
also verify that my terminal prompt shows:

$ mavericktest at mavericktest-laptop

and then check System|Administration|Users and Groups and find that the
user is showing lucidtest & mavericktest (the latter in faint grey below
lucidtest). Now, I can't change that while logged in, so I try from
Recovery|Root and still can't manage to get it right. I finally end up
enabling Root, login to that and changing the username in
'System|Administration|Users and Groups', logout of Root, log in to
mavericktest (it's showing correctly at the GDM login screen now), and
kill the Root account. It's now installing the maverick dist upgrade.

So here is my question; how should/could I have done all of this
easily/properly & particularly what did I miss for the GDM login name issue?