aliasing - inheritance?

I have a large amount of data not within htdocs, which I want apache to
serve to the public,

One virtualhost is completely aliased to another drive

<VirtualHost 192.168.5.5:80>
ServerName domain.org
ServerSignature off
DocumentRoot /domain.org/public
Alias / "F:/file_store/files/"
</VirtualHost>

this works just fine provided I explicitly allow access to it using a
directory directive

<Directory "F:/file_store/files/">
Options Indexes MultiViews FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all
</Directory>



the difficulty came when I ran out of room on that drive and it just
happened that one of the folders below
F:/file_store
called F:/file_store/files/large_dir
could be moved to another drive
G:/moved/large-dir

which meant that I wanted to alias
F:/file_store/files/large_dir
to
G:/moved/large-dir

Ive tried Alias and AliasMatch

.....
Alias /large_dir "G:/moved/large-dir"
</VirtualHost>

.....
AliasMatch ^.*large_dir/?$ "G:/moved/large-dir"
</VirtualHost>

Try as I might I cannot find a configuration that works, for instance
creating a folder called -large_dir and then adding an alias into the
virtualhost container does allow me to go into that folder, but then
theres some kind of buffer overflow and I get booted back to G:/ and
then to the original F:/file_store/large_dir (I can see this using
filemon)

Of course in an ftp server one would just alias the physical path of
the moved folder to a folder with the name you wish the users to see,
and I thought it could be as simple as that under apache.

If you arent bored by the whole thing, like I am, and can see the wood
for the trees - Id be happy to hear from you!

m