convert a large Static site to a CMS

We have a Large site (around 100,000) pages we want to convert to a CMS (we prefer Joomla) We need the pages after entered to CMS to keep the same URL (cause of page rank) There is a need for plugin component development (a tool to show game board like chess board and moves etc..) Detailed design and site sample will be given to bidders. Prefered Biders that done similar things and can show saples of old and new sites. Thanx