Enable Debug Mode - First. Try your steps again. If debug have not error then open "Development Tools" in browser, select "JS Console" and examine for mistakes. Screenshot of debug or console error attach here.
Bro. You should write this in request thread. I spent "reaction" it is limited resource on this forum!!!
And for "customization interface and easly drag&drop modules add to the frontoffice" you can use modules from this office. You can build any wishes. For example...