I'm going to make a house which I'm going to stack approx. 6 9x13 on top of each other and then sculpt. Should I put dowel in the bottom 3 layers and then a cake board on top of that and then put the next 3 layers on top and then dowel all 6 together or do I not need the cake board?
Thanks for your help!! 
I WOULD USE A CAKE BOARD AND DOWELS. WHAT I ALSO DO IS MAKE A DRAWING OF THE CAKE AS I GO AND WHEREVER I PUT A DOWEL AND DRAW A RED LINE. JUST TO MAKE SURE NO ONE GETS HURT OR ACCIDENTLY GETS IT IN THEIR SLICE AND BITE IT.
I agree with Kitagrl, if I were going to attempt something like this, I would probably take those 6 layers of cake and treat them as 3 cakes of 2 layers, each on it's own board and dowel and stack them. It gives you 2 opportunities to get the stacks level and a natural break when it comes time to cut the cake into slices. I wouldn't try all 6 layers stacks with only filling between them, even with them doweled.
Thanks..that sounds like a better idea to put a cake board every 2 layers. Another question...O.K....I put the first 2 layers down and now I'm ready for the board. Do I put my BC down 1st and then the board on top of the BC or do I lay the board on top of the cake? Do you understand what I'm trying to ask? : ] Just seems like if you put it directly on top of the BC it will all come off when you lift up the board to get to the levels underneath, but if you dont use BC it seems like it would be to....dry I guess is the word I'm looking for. Sorry if I'm confusing you! 
My rule of thumb is to have a cake board/support every 4" of cake. It hasn't failed me yet... although some of my supports have, but that is another story.
When I am doing a carved cake like that I also usually freeze all of the cakes for at least 12 hrs, stack (without any boards) and then do all of my carving while cold, Score a line down one side of the sculpture so I can line them all up again, dissasemble and then add fillings/buttercream between all of the layers, this is where I also add in my doweling, it seems to work pretty well for me.
HTH
I saw in your photos you've finished your cake. Very nice. My question is how in the heck do you sculpt a cake w/ cake boards between every 4". Maybe I'm not understanding what everyone is saying to do
It does. I was just sitting here trying to visualize cutting through boards while sculpting---what a pain. But surely people wouldn't attempt that! I think it would end me sculpting cakes. 
I saw in your photos you've finished your cake. Very nice. My question is how in the heck do you sculpt a cake w/ cake boards between every 4". Maybe I'm not understanding what everyone is saying to do
I carve all of my cakes frozen, so I stack while cakes are frozen, then carve what I need to, I score one side of the cakes (for easy realignment later), I unstack and then rebuild with fillings and boards between all of the layers.
You want to restack after carving if you are putting filling in otherwise you may cut off your dam around the filling and have filling coming out of the cake (not a good thing trust me on this one, Lesson learned the hardway)
This does make more sense to carve, disassemble then fill & reassemble. I was thinking carving & cutting through boards while carving would be pretty difficult 
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