For one of my recent card classes, we made a Tower card for Valentine's Day! I found a great tip online....to use Designer Series Paper for the centre of the tower. It makes the card less bulky!
This is the front of the card and it is the first panel on the card!
The second panel.
The third panel.
The fourth panel.
Here is what the card looks like from the top. Note you can see the DSP in the centre!