Create a Wordpress Template for an interactive product comparison site

I want a WordPress theme for a comparison site where logged in users can select two products (any products they like and compare one to another. The post title will be "[Product A] versus [Product B]?". In terms of the layout of the post, there should be an area by default where an image is uploaded for each product which shows side by side and automatically resizes (with a default image automatically showing if one hasn't been uploaded) . I want the original author to be able to give up to 5 reasons in favour of each product and allocate a number of points between one and 10 per reason (so max 50 each side) and for the post to calculate the "winner" based on the points allocated by the author. I then want to be able to allow registered or signed in users (able to sign in via the usual wordpress codex or via social media accounts) to be able to join in and add their own single reason in favour of one side or the other (not both) and for these to be taken into account with the score by adding one point for each reason given. At the end of 21 days, an overall winner will be declared automatically on the page and the original posters' reasons and the additional reasons should be shown and the page will then become static. I also want some sort of "kudos" rating for each registered user who should get 25 points for posting the original comparison, and then additional users should get one point if they added a reason to the "losing" side (when the 21 days are up), or 5 points if they added a reason to the "winning" side. The users "score" should display wherever they have posted, I suspect that most of this could be done using existing plugins (and that's fine as long as it works as I want it to work). The template must be attractive, easy to customise and fully responsive.