I'm thinking of combing my tiramisu recipe into a cake this easter. Please tell me if you think this will work....

Make a white cake and slice into three layers.
Poke holes throughout the bottom layer and pour 1/4 cup strong coffee over the center.
Cover with marscapone/cream filling and cocoa powder
Top with middle layer and repeat
Top with final layer and ice with whipped cream and decorate.

Anyone ever tried doing something like this?. I'm concerned it will come out soggy

I would definitely worry about it getting soggy. I make a tiramisu cake but always use a dry sponge cake as opposed to white cake. I absolutely soak the cake with a coffee/liquor/simple syrup mixture and it works beautifully since sponge is designed to hold that liquid.
HTH!

my aunt makes a tirimisu cake and it is great!!! not sure how she did it though. It was not soggy at all. have you checked recipezaar?
they have a lot of variations.