MODx Plugin Development Project

I need a plugin development for MODx CMS. The plugin will work exactly like one WordPress plugin which best matches the requirement. This MODx plugin will function all features of [login to view URL] . Take your time to review it carefully. There will be image/graphics to show the donation meter. The graphics can be uploaded from admin. The Plugin will have following features: 1. Two Content Area for showing widget 2. Two Images Upload area 3. Calculation of Donation 4. Donation Goals/Target 5. Need Donation to meet the target Inform me the time for development and cost.