You could take a look at this thread...
CSS thread
The swf 3d cube module will probably still have a large space reaming below the module, due to the shadow and swf dimensions. The 3d modules are sized to allow for the expansion of the images when they're in transition. You maybe able to make the gap slightly smaller by editing the modules file which sets the size of the play area. If you go to small the shadow will get trimmed.