Hi Werner,
The app doesn't require the LGIM data model; you can configure which fields and layers contain each of the relevant pieces of information in the config.js file.
As stated above - The app does require the configured map the be hosted in AGOL. You can still use your Enterprise layers, but you'll need to add them to a map in AGOL and reference that map in the app configuration.
If you are encountering specific error messages, please share them. As long as the only changes you are making are in the configuration file, this app is also fully supported by Esri Support Services. If you need in-depth troubleshooting help with the configuration and deployment, I suggest giving them a call.
-Allison