You guys were busy while I was snoring!
Joomla can stand in it's own directory. Simply put a redirect in the base directory. Here is an example of mine (which does not point to a Joomla directory but theory the same):
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head><script language="javascript"><!--
location.replace("http://www.garywilliamson.co.uk/pages/")
//-->
</script>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
var pageTracker = _gat._getTracker("UA-1165523-1");
pageTracker._initData();
pageTracker._trackPageview();
</script>
</body>
</html>
You will see I have my Google analytics urchin in there as well.
Now that I see that your requirements in terms of look and feel I urge you to have a look at the turning gate indexes again. They are REALLY simple to use. You control your site fully from Lightroom. To create a page you just create a collection and apply the web style to that collection. They use XML indexes which means that if you add a subdirectory page the parent page automatically adds a link.
The changes you can make to the look is limited however you could mock your current style very easy in these indexes as they are similar.
One of the benefits is you can throw up a page that is not visible to others for clients (by giving them the link) and once there they can navigate to your other work (main site) easily as navigation headers are included. This has lead to further business for me.
My site is created entirely this way except the blog which is driven by Wordpress.
If sticking with Joomla can I suggest two good resources.
www.joomlart.com and
www.templateplazza.com. They create template with lots of useful java tools and ready-made CSS which adds to the richness of the look and feel of any site.
I created this one using an of the shelf joomlart template:
www.invernesscameraclub.co.uk
It is still in it's early days (couple of weeks old) as I am working out how to implement community/gallery tools.
Hope this information is of some use.
Gary