@rvandeguchte: You don't need to make Pate template. I think you are confused with "Full Width" layout and "No Sidebar" layout. No Sidebar layout has padding left and right but Full Width Layout doesn't have it.
Thanks for your tutorial about page template. But sorry, you are not supposed to edit any core theme files inside 'catch-kathmandu' directory. As all the edits made inside 'catch-kathmandu' will be reverted back to original when you update or upgrade your theme. So, all your edits will be lost. So, if you want to edit core theme files then you need to build child theme and add the page template.