Help! Need Cover Cake That Is Taller Than It Is Wide In Mmf
Decorating By Jennle Updated 11 Dec 2009 , 9:32pm by mommyle
Hi and Welcome to CC, Jennle. 
Here are examples of some pretty tall tiered cakes that were done that way:
http://blog.pinkcakebox.com/damask-crystal-wedding-cake-2009-05-25.htm
http://bignutbrownhare.wordpress.com/
Would probably be more easily done with a commercial than homemade fondant (less stretching, etc.) until you're more experienced. (A good opportunity to use those Michaels/Hobby Lobby 40% off coupons to get some Wilton fondant to practice with - definitely not to eat!)
Everything you need to know to make, decorate and assemble tiered/stacked/layer cakes:
http://www.cakecentral.com/cake-decorating-ftopict-605188-.html
Above super thread has popular CC recipes for crusting American buttercreams, several types of fondant and doctored cake mix (WASC and other flavor variations) - and so much more!
Might want to grab a cup of your favorite beverage and get comfy - it's a long read. 
HTH
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