Flummoxed by custom theme no theme name or template declared

I have recently gotten a gig for a site that has it’s own custom theme that needs updating. I am familiar with creating themes for WordPress that follow “the guidelines” but it appears that the person who wrote the theme, did not read them and hand coded (PSD maybe?) the entire thing in html.

First there is the style.css – there is no theme name, no template name,and it only contains three lines:

@charset "utf-8";

/* CSS Document */

.smartItemsDetails{display:list-item !important;}

there are other style sheets but none of them have the theme name either. the one that seems to control most of the theme is called “main-style.css” but there are css for colors and a couple more just for fun.

The header directly links all (about 10) java files cufon ready, titillium, and a bunch of jquery but they are not enqued or registered that I can find. And we shall not even discuss the strict doc type, hard-coded elements style and content that it contains…because well… that at least I can see how its working… ??

Well… I am not even sure how wordpress is picking up this theme, What am I missing? Has anyone else ever seen such a thing work?

My instinct is to run to a test site, create a theme that looks like their theme and switch them out because I’m thinking it will be far less hassle in the long run. But I don’t know how they are going to react to that.