Convert large 4images to Drupal based gallery

I have a large 4images gallery website that I want to be converted to some Drupal based gallery. PM me for the URL. There are many ways to build an image gallery in Drupal, and I want you to specify exactly hoow you are going to do that when bidding. Here are some requirements 1. All the URLs must stay the same, or at least the most important ones (categories URLs) should stay the same 2. I do not want any of the default drupal themes. So the page look either should remain the same as now, or a new design may be proposed. Specify what do you want to do when bidding. Thanks