I would love to have ideas on making a 3D castle cake. I have a picture of one it almost looks like a candy coating was used and then made to look like bricks. I have an order for one.
That is a beautiful cake! The only template I found in the galleries for a castle cake is this one...
http://cakecentral.com/cake-decorating-photos_display_121_-70656.html
Not sure if that will help give you any ideas. Jen
Do a gallery search on this site for "castle"--there are over 1200 amazing ideas for you! 
If you find one you like and pm the person who posted it, most people are more than willing to share techniques. Good luck!
This cake is covered in fondant and a brick impression mat was used to get the design. Not knowing who made the cake, I can't tell you more than that.
I am going to be making the top part of the castle this week to add to another cake. So I guess I will use some of your hints and wing the rest. It ought to be FUN!
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