RichAtVNS,

I wouldn't do it.
CSS has the advantage of speeding up the page load time.
It also makes it easy to customize a page more than a page with tables ever thought about doing.

So the questions you need to ask yourself...
Do you need to speed the pages up?
Do you feel your site needs a face lift?

Otherwise you are just taking a silly chance of messing up a good thing to make such a big change.
If you really still want to play with the idea of knowing what you could accomplish with CSS as far as a website then make yourself a sister site and use that as your new play toy. Don't use yours for curiosity. At least the sister site can tell you what you would have been in for and the walls you may hit along the way. Css has such a learning curve as it is already.

Understand that this is just my opinion though. Wait around and see what others say as well.


Good luck in all you do,
Google Junky