Classifieds/Auction web page

Hi, I’m looking for advice. I would like to build Classifieds web with some auction functionalities. For this purpose I wanted to use some of these themes:
– http://sitemile.com/products/wordpress-auction-reverse-auction-theme/
– http://www.premiumpress.com/wordpress-auction-theme/
– this one doesn’t allow to add ads however I like design http://themeforest.net/item/essential-responsive-retina-woocommerce-shopping-and-auction-theme/full_screen_preview/5789584

The design of the future web should look like:
http://desiin.sk/wp-content/uploads/2015/09/Uvod_v03_01.jpg
http://desiin.sk/wp-content/uploads/2015/09/Detail_inzeratu_v01.jpg
http://desiin.sk/wp-content/uploads/2015/09/Detail_pridania-inzeratu_v01_cast1.jpg

What should be the best way to approach this project?
1. customize template to fit propose design and use template already developed functionalities?
2. build whole web from scratch?
3. use template design, with some adjustments?
4. used the third template and add functionalities to add ads, users reviews etc.?

Thanks for any advice and comments.
Michal