Hey gocayman,
Haven't seen a website that uses tables in a while!
I had a read through your website, and honestly the easiest way to deal with this would be for me to rebuild the whole website, but this is not as hard as it sounds.
I know you requested straight html/css, but this defiantly looks like a job for a framework called bootstrap. This isn't a bloated CMS framework like WordPress or anything like that, it's a framework that makes it easy to produce great looking websites. One of the biggest advantages is that the website would be Mobile Responsive!! The html and css will still be lightweight, and bootstrap will help make the website more cross browser friendly.
There is probably only one downside, I cannot guarantee a "100%" conversion, I only say this because if you take a look at the header underneath the menu on any page, you will see that the blurb portion is actually an image, this is really bad practise, and I would probably convert this to actual text, and getting the exact same font probably won't be possible (but will be close.) Apart from that, the rest of the design looks fairly straight forward and will look great on both mobile and desktop computers.
My bid is a bit low, and to be honest I would probably charge someone maybe 300-400 dollars for this here in Australia. But the competition is fierce on this listing. I did a very similar job for this website: [login to view URL] which is bootstrap over WordPress.
Regards,
Christos.