I don’t really understand why you want to use a menu to control this but it wouldn’t be very hard. First you obviously need a new page template for your grid which you will use get_users to pull your users for display – https://codex.wordpress.org/Function_Reference/get_users
Now if you want to control the order and whom is included in the grid via a menu what you would do is use the function wp_get_nav_menu_items() to get the items of your menu so that you can loop through the items and update the include parameter of get_users accordingly based on your menu items.