I know this is a very old post and response - but none of the templates listed above are "horizontal scrolling" They employ various blocks like a gallery block slide show which is by virture of a slideshow horizontal or summary block blog content slide show - the same.
Taittinger Champagne website is a "horizontal scrolling website" https://www.taittinger.com/en/demi-sec
Which means if you page up/down arrow up/down the site scrolls left/right the same with the track roller on a mouse on dragging vertically on an apple magic mouse!
It would be as if you are building "Index pages" side by side instead of stacked upon each other. THAT is a horizontal scrolling site. NOT a view window to a slideshow.