В числе прочих -
This is a new release, a PHP version of SMF2 to Kunena, is possible that you find errors, i just did tests with 1 very small database on my PC, after few hours (i have few experience with php scripts) and remember that is the first beta.
working with small databases, wait for new releases, BUT will work with bigger databases changing the MAX EXECUTION TIME of php until a new release.
Backup your Joomla database before any modification.
Include a small html to bbcode converter.
Updated: wasnt working something, fixed for now...
Там есть скрипт, только не пишут как с ним работать, и на английском...