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The Legend theme was just the most simple theme that I could find at the time... I think I got it from the theme directory, way back down the list.
But if you wanted to do something similar, I would use the latest version of the default theme today. What I did on the above site, was to first create an L -shaped frame design (so, a frame for the top bar, side bar, main window, and then a frameset file to contain all these frames). In the main frame, or the main content window, I think I placed an <iframe> tag, which called the XOOPS site. On the theme that I had installed on the XOOPS site, I edited the theme so that only the main column remained...i removed the two side columns (you can do this pretty easily in Dreamweaver etc.)So when you see each page of the site, you are really seeing one of the content pages that was made in the Content module (or TinyContent module, etc.).
Jeffgr