You've provided a fantastic detailed document of what you're looking for, and it's helped us make a decision on pricing.
We're web designers at heart, but we've had years of experience working with PHP, ensuring security and integrity. We'll be using the Laravel PHP Framework if awarded your job, because we believe it will offer the best and quickest solution for you. In terms of design, we'd love to hear some of your ideas and implement them. We're based in England, and we do not outsource our work - everything we build is with love and we ensure quality at a price that is generally a lot lower than our competitors.
We'd love to talk to you more indepth about your project should we be awarded it!