■ Description is absolutely clear. ■ I have 12 (my own) Joomla based websites and I manage more than 20 customer's sites, also Joomla ready. I really believe that I can explain you what and how to do to solve you problem ■ I have similar construction of several of my sites. I plan to offer you migration, what I done many times. The secret is, that we will archive everything, first. Saving database and web active directory onto a safe place, we can use cms2cms or, whatever you say to migrate to a newer version 3. ■ If you interested, please contact to my e-mail with detailed description of your problem and exact situation with site relations, modules and permission descriptions. Do not hesitate to describe the situation how-it-is in simple words on an e-mail. I hope we will do your stuff successfully. And hiring first, ofcourse.