Rewrite related content modules on adult Joomla site, optimizing and relating it by tags

---> Please only bid this project if you READ and UNDERSTAND it. <--- Hi, I have an adult site (legal content, obvious) in Joomla! 2.5 and I need rewrite related content modules on galleries and stories pages. Already exists a current module on the site, but this is wrong written, relating content inaccurately. The new module should be: - Are two modules in every gallery page and storie page. The first module (simpler) will display the latest content (thumbs) from another category. The second module will display content (thumbs) related by similar page tags (by tags order). When users click in "Show More" button, should load more thumbs in the same module space; - Maintain current modules css style. Only change backend codes; - Codes should be extremely clean and light to avoid overloading the server. Queries to database should be highly optimized. This is extremely important! See attached picture with the current modules circled in red. Best regards.