SmartFAQ is developed by The SmartFactory (https://www.smartfactory.ca), a division of InBox Solutions (https://www.inboxsolutions.net)
How I can convert my CSS theme to use it in Xoops?
Xoops is very capable of using tableless layouts with CSS. This FAQ is beyond a simple 'how to' answer, but we suggest you look at other tableless themes to see how the CSS is used. Take a look at http://www.dcdezines.ca/ for some inspiration and tutorials.