So as you know already, if you buy a SaaS environment you have to buy a PaaS for SaaS environment in the same Identity Domain, better known as JCS SX PaaS. This PaaS environment makes your life easier when it comes to Customizing and extending your SaaS.
We have created an instance of a Oracle PaaS Demo application in our servers that looks like SaaS instance. When it comes to extending your SaaS you want your PaaS extension integration into SaaS pages as smooth as possible.
To achieve that you have to use Oracle UX Design Patterns and Oracle RDK.
You can visit our on premise PaaS environment at http://cloud.ancapit.com:7003/AppsCloudUIKit/faces/Welcome