PHP MODx Module extension

We need an extension to an existing MODx module written in php and javascript. The extension will allow users to define page layout using drag & drop rectangle objects that the user can expand horizontally or vertically and position on the page. Output will be html/css template layouts written into the MODx database using divs to define the areas and sizes chosen by the user for the various components. User will be able to load previously saved template layouts. A later project will user choice of menu formats.