For the UI customization with Style sheets look at this example:
http://qt-project.org/doc/qt-4.8/widgets-stylesheet.html
In the example, the form background is customized, the check (and radio) buttons are completely customs and also the buttons.
For the other points, I suggest you to open one thread for each of the remaining with a title more expressive and without “URGENT”, so other people can help you.
For example: open a new topic with the title: “Forcing uppercase only into QLineEdit”.
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