Hi,
I have checked out your website, and it looks like detailed integration. But, it can be converted. The problem at this point is that you use multi stars rating for rating the casinos (with 3 elements: Software, Support, Promotions items), and currently there is no tool for transferring multi rating data from GD Star Rating to GD Rating System. This is in development for the next major 2.4 version (scheduled for September). Also, GD Rating System Pro will require Multi Ratings Addon purchase to work with multi ratings.
Once the data transfer tool is done, we can use it to convert old data to new plugin format, and after that, I can work on the migration of your code to the new plugin. For more information about that, you can contact me via email: support@dev4press.com.
Regards,
Milan