Not really sure what your asking. We released support for phpbb 3.x series one and a half years ago when phpbb 3.0 gold came out. What Integrations we support!!
We do not support stylesheets in phpbb 3 because there is no standardized styl3 class names anymore in the 3 series like there was in 2. Without standardized stye class names it is impossibly to remap our style class names to phpbb style class names.