First off, add two zeros to the bid, $4000. This isn't a simple webpage. I do SMS for a living. There are a lot of specialized rules that the message flow has to follow, and they are different per carrier. I can help you get setup with an aggregator and get the campaign approved. I've got lots of experience in writing the code used to send and receive messages, as well as all the database stuff. The website will be a easy.
The shortcode itself isn't cheap. The project isn't cheap. If you still want to do it, let me know.