Custom Product Designer Web App

Hi, I represent a paper wallet company ([login to view URL]).. We make wallets from a single piece of printed paper, which is cut, then folded in a special way to create a wallet. We are looking for someone to build a web-app to plug into our current Shopify store which allows customers to create their own custom wallet designs with uploaded or Instagram images. We would like the app to visually look and function the same as the custom design section of the [login to view URL] site ([login to view URL]).. Full page, very simple and easy to understand with some options although not too many. The functionality of the custom app should be the same as one of our competitors sites, Dynomighty wallets ([login to view URL]). Once all the images are added onto the wallet template and they click the 'render' button, the customer can see their product in a more real-life vision. The customer can then add this product to their cart and purchase it. Once purchased, in the backend area of the app, the images which make up the custom wallet design should be auto-rendered into a pdf or .psd file which we can then send straight to the printer, print out the single piece of paper, cut it and fold into a the wallet.. Sorry if this is hard to understand. I would just like some more information from you to know if this is something which you can build? the estimated cost for building and the ? Thank you and have a great day : )