Demo Custom Template build with WPBakery Page Builder.
See default template in theme in here
Easy Build Custom Template for Single Product Page
If you have the problem concerning display single product of Woocommerce when use WPBakery Page Builder. you want use WPBakery Page Builder to build templates for each products when view single product.
Allow Custom Cart, Checkout and My Account page
Frontend Editor Custom Template
With this plugin, you can see how your content will look on the frontend and you can edit it.