Build a Website based on design supplied with a custom CMS back-end

Need a basic website with a content management back-end that allows for rich text and HTML input. The website will have edge to edge panels spanning the screen that will house HTML and rich text input. The panels of content will be stacked on top of each other and be a fixed height. Images and content should be able to go all the way to the edge and seamless stack onto of each other. Infinite scrolling design is needed. Need to be able to change background colours with colour selector. Once the content is entered i need to be able to publish the panels to a subdomain for people to view once they have given me their email addresses. So it will need to go through the email verification home page. I have done the design and can answer any questions relating to the look, feel and functionality. Responsive design is preferred so it can work across different devices from Desktop browsers, iPad and iPhone devices. I have designed it so it can work across devices. Want the ability to capture email address with confirmation emails sent. Preferably use a third party email client - like MailChimp to organise the maintain email correspondence. Depending on the cost and complexity - i would like the ability to create and track user accounts. This will need to be discussed and worked out.