Wedding Cake Questioin

Okay I am making a wedding cake in just about 2 weeks and the bride wants the staircases for her cake.  My question is has anyone used these staircases before?  I am concerned that the staircases are not long enough.  The bride has the fountain on the bottom with 13 inch pillars and then a 16 inch cake and stacked directly on top is a 12 inch cake and then 5 inch pillars and then a 6 inch anniversary cake.  There will be two 8 inch satellite cakes...but I am affraid the satellite cakes will be to low to the table...and if they were raised I am concerned they will look off just sitting on pillars.  Can someone help me with this.  I have looked at thousands of pictures of cakes using the staircases and in all the instances the satellite cakes were two tiers.