Rails Ecommernce site, already 70-80% done needs finishing

I am 70-80% done with an eCommerce site that has some kickstarter/crowd sourcing ideals. I have: -user sign in/account creation -basic ordering on our side, need to have it using amazon FPS still -a basic homepage with basic product view, -bootstrap UI- mostly done -models all set up, may need to only add a few fields to existing models -and some more, it will be easy to see when you start the project What needs to be done -ordering system needs to be finished/ working with the Amazon Flexible payment Service(FPS)( I already have the gem installed) -General UI for needs to be updated/cleaned up -site redirects need to be cleaned up(like after you sign in it should redirect to the last page you were at) -validation of data -implement tagging for products and searching/browsing by them( the model is already set up to support this) -there are a few other things that I will discuss upon you accepting the project But there is not a lot of work left to do on this, I just have a deadline that got moved up 2 weeks and I am the only one working on this on top of other projects.