Hello,
We are a team of professional Drupal developers and consultants based in Moscow, Russia. Over the last 5 years, we have implemented many Drupal projects, including complex sites with custom themes and modules.
Following up on my earlier message - it could be the case that it would be more or less simple to set up, however it depends on how your Drupal site is configured. If you could give me access to the back end I could check and let you know. If it's only the second part my bid would stay the same (otherwise I'll let you know). Is that possible?
Looking forward to working with you on this project.
Thanks,
Alexey