Customise Tshirt designing wordpress Plugin

We are building a website where a user can make a cutomized tshirt using the tool on the website. We are building the site using WORDPRESS and we have already found a existing plugin which can do the job for us, but we would like to add a few more features to the plugin so that it completely suits our need. Here is the link to the Plugin : [login to view URL] We want the following additional features to be added to the above existing plugin : 1. User should be able to remove the background of the image ( Image uploading feature is already existing ). 2. The size of the design uploaded or chosen should be displayed such as A4 or A3. You can check the below link to check what kind of features we are looking in the customisation : [login to view URL] You can check the above tool to understand my requirement in a better way. ( ONLY SERIOUS WORDPRESS DEVELOPERS APPLY FOR THIS )