Custom Salesforce.com Application

I’m looking to have a [login to view URL] app developed that will allow us to include a small basic drawing at the bottom of our salesforce quotes. We are looking to develop up to 50 “blocks” or items. These blocks will then be used to drag, drop, rotate and snap into place to create the product layout. We will then need the ability to add logos and also text to show the various dimensions of the layout drawn. This drawing will then need to be added as a second .pdf page or to the bottom of a quote. We are looking for someone with experience in developing apps in the salesforce platform.