Hi there. Sorry for your awful past experience.
I'm not sute how much work will have to he done without looking up the code. However, I'll bid a mid range because I know how it feels to be left hanging up with work to be done. So I'll complete the extra work as pro Bono beyond this bid.
If you need me to finish this, I'll be happy to help. I'm a professional developer, and I do websites for a living: Blogs, e-commerce's, corporative websites, etc.
For your sake, we can discuss this and check the website before starting up, then we could have a chat, and start this exactly as you want.
Looking forward to hearing from you,
Ruymán.