18895 postnuke-Database to Joomla-DB

I have created a Freeski-Web-Community-Portal ([login to view URL]) with postnuke-CMS. It still runs on postnuke 0.7.2.6-Phoenix (not the actual version). I now would like to change this whole Website (DB) from the (old) postnuke-CMS to the newest Joomla-CMS (1.0.8). Following contents should be transferred to Joomla-CMS (it is supposed to work properly): • users (including user names, passwords) • News articles (they should be split into 4 categories, when realisable with little effort - if work is too complex, put them all in one archive) • Forum (from pnForum to Joomlaboard Forum Component (more complex?!)) • Link list (Structure, clickable URLs and matching descriptions) If realisable with little input following contents should be changed too: • polls • comments • pm's Info: I have found a script (written in pearl) another webmaster has once used with success (see attachment) Perhapes it can be a help for you? I can forward you a backup of my actual postnuke-DB. Further I can arrange access to a test-server including installed Joomla-CMS. Deadline: within 2 weeks (mid June) Maybe you have already done a project like this you could show me as a reference. Thank you!