I've never made this, but you might get some ideas from it.
http://allrecipes.com/recipe/tiramisu-layer-cake/
Also, I think that the Gourmet Flavours thread might have a Tiramisu cake on it.
I had one but it was in a magazine and I cant find it at the moment, It was very soft at the end though so stacking may have been difficult but I think the secret to true tiramisu taste is Marsala wine so I would go with a recipe that incorporates that somewhere. The recipe I had involved brushing on strong coffee to one side of each layer and Marsala on the other and then a creamy type filling with more Marsala.
a true authentic tiramisu cake is not gonna be stackable. 
I the other and then a creamy type filling with more Marsala.
I use cognac or sherry for my tiramisu.
To the op. You can only make it tiramisu flavored which means coffee, mascarpone and some type of liquor (optional) . You can't make a true soaked cake to stack it.
I would maybe incorporate some espresso into the yellow cake mix or brush with espresso, and use a mascarpone egg and whipped cream mix for the filling. You can even use a buttercream chocolate mocha frosting on top. I always dust each layer my tiramisu with cocoa and then for the top layer also shave some chocolate on top. Just experiment a little first.
I the other and then a creamy type filling with more Marsala.
I use cognac or sherry for my tiramisu.
To the op. You can only make it tiramisu flavored which means coffee, mascarpone and some type of liquor (optional) . You can't make a true soaked cake to stack it.
I would maybe incorporate some espresso into the yellow cake mix or brush with espresso, and use a mascarpone egg and whipped cream mix for the filling. You can even use a buttercream chocolate mocha frosting on top. I always dust each layer my tiramisu with cocoa and then for the top layer also shave some chocolate on top. Just experiment a little first.
STOP! You're making me so hungry... 
Great ideas. Thanks.
For preparing a delicious tiramisu without eggs I use this recipe:
http://www.squidoo.com/my-easy-tiramisu-recipe
I use dark rum as a flavor and no eggs. It's very easy to make and doesn't take a lot of time. My family loves it.You can also put it in the round cake pan if you want to have a cake-like look.[/url]
In general you must use a regular firm cake NOT a soft white sponge to be able to stack if you want to add the syrup that "makes" tiramisu.
Look up the book "wedding cakes you can make" by Dede Wilson. Public library or used. I think there is a tiramisu flavoured wedding cake.
Dede Wilson's other wedding cake book also shows stacked cakes that have had a careful dose of flavouring syrup.
Check also cake books by Rose Levy Beranbaum as there might be the tiramisu idea.
Yeah, this mine is an ordinary tiramisu not a round cake.
But you're right; if you want to make a cake out of this, than you have to use a firm cake (a sponge cake for cakes) not Savoiardi biscuits.
But I don't understand you exactly what you mean by this syrup, because when I make cakes (eg. vanilla or chocolate cake) I never use this syrup but still the cake is stacked.
pmarks0, you beat me to the punch as I was also going to recommend this recipe. I have made this cake and it is delicious. It is made with a box cake mix but I suppose you can do scratch. I do the Duncan Hines white box mix. Such a time saver and the taste is great. And I have stacked it with no problems. As long as you have a good support system, you can almost stack anything. The weight of whatever you are stacking should rest on the supports, not the cake itself.
It is not made in the traditional way, but the tiramisu flavor is there. And it is good!
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