Making a tiramisu or s'mores ice cream cake - need opinions

So I've decided I'm making an ice cream cake for NYE, and I'm deciding between s'mores or tiramisu and inspired by this: http://www.grubstreet.com/2015/07/par...

Dinner will be leaning Italian, hence the tiramisu idea, but I may be more excited about the s'mores. Want your opinion on which below sounds better, and then any ideas/suggestions/tips on any components of either. Here we go...

S'mores:
Toasted marshmallow ice cream layer
Chocolate cookie separator (like ground Oreo crusts, thin layer)
Chocolate frozen cheesecake layer (cream cheese, cocoa, cool whip?)
Chocolate cookie separator
Graham cracker ice cream layer
Sides garnished all over with Graham cracker/sugar/salt mix

Tiramisu:
Mascarpone ice cream layer
Chocolate cookie and instant coffee separator
Zabaglione ice cream layer (or do I also flavor with coffee/espresso?)
Chocolate cookie and instant coffee separator
Chocolate ice cream layer
Sides garnished with crumbled ladyfingers (don't like the look of whole ones)
Top garnished with cocoa powder

Thoughts? I have a normal 9" springform but am thinking to find something taller and not as wide... Springform or not. Never made an ice cream cake but figure I'll make each layer, freeze, and do next layer.

Not sure of my separators/cheesecake layer ideas, but I like ice cream cakes to have more texture than just ice cream.

Help me build a masterpiece!