How to use Tor over Lan

For this I would recommend Proxifier.

Proxifier intercepts outbound connections made by Windows applications (I think it also supports Mac) and diverts them through a proxy or chain of proxies.

It will allow you also to choose which applications to intercept. It supports basic RFC1929 authentication (cleartext) over SOCKS5. It's also in current development and supported.

If you want to go for a secure auth mechanism (GSSAPI) I only know of 1 socksifier that can support that, and that's the OpenText SOCKS client.

I'm a beginner myself, but this came to mind... Can't hurt to try :)

Just set the ServerName directive to foo.localhost and use the ProxyPass to direct it to a LAN address.

Something like:

<VirtualHost *:80>
   ServerName foo.localhost
   DocumentRoot /var/www/foo  #doesn't matter because we're not going to hit it
   <Location />
      ProxyPass http://192.168.x.x/
      ProxyPassReverse http://192.168.x.x/
   </Location>
</VirtualHost>

Then your other internal site is accessed like:

<VirtualHost *:80>
   ServerName foo2.localhost
   DocumentRoot /var/www/foo2  #again, doesn't matter
   <Location />
      ProxyPass http://192.168.x.y/
      ProxyPassReverse http://192.168.x.y/
   </Location>
</VirtualHost>

I'll admit, I don't know if that'll work, but it seems reasonable to me ;)

Also, you didn't mention how many computers were on the LAN, but if it's only a few, maybe an edit to the /hosts file would be your solution.