You don't have to. All the resources needed are included.
Sure, just add another Lightbox2Panel to your page/component/whatever
Nope, don't worry. This is Wicket! The magic of HeaderContribution will take care of that.
Just contact me.
Source-jar is available in the download section. I'm currently looking for a place for direct CVS access.
Sure. Be sure to respect the contained components' licenses.