I would say from my experience that the W3C standard is of trivial importance when actually designing a site. I would say it’s more of W3C suggestions then standards. This is because Microsoft IE 6&7;(& probably 8) are NOT W3C compliant and IE has about 70% market share. Although it is probably a good idea to keep your pages close to the W3C spec, I wouldn’t break my back over it.
I would say that it is FAR more important to break up you files into HTML and CSS. But this is generally already done with these templates.
Anyways, for anyone who want’s you can check the demo site @ http://75.17.88.183/. However, the site is on my laptop and is NOT at a permanent location. So, if you can’t connect to it that’s why. All I can say is try again later.