comic book panels

Hello,

I'm making a comic in inkscape and already I have finished all the characters and backgrounds.
Now I'd like to make the panels. How do I go about that?I imagine maybe I need a new white layer with rectangular holes cut out in it (so if I paste something below, it appears to be within the panel)? But how do I do that? "Clipping" will LEAVE rectangles in a layer not cut them...Well I don't know. any Ideas?

Please help

I didn't find the right solution from the internet.

References:
http://www.inkscapeforum.com/viewtopic.php?t=5165
Motion graphics video company

Thanks