Hello,
I am would really like to work on this project as it's something what I am expert in. I got basic idea of what and how you want custom script to work. But, would need to discuss exactly how you want it or how you have planned to implement it.
We can decide the price after clarifying full requirements.
I have a team of developers and designers too who can be of help to get things done faster.
Let's discuss to know more about each other and I am sure that I can deliver you best quality code as per your expectation.
Thanks, Talk soon.