I fill between two 2" layers. I like nice and tall cakes. I think a 2" torted would be kinda short for my taste.
I ask if the customer wants a filling. On teh last cake I did, I suggested a cookies n cream filling or said I could do whatever (close friend - wouldn't just offer "whatever" to anyone if I was more set-up and professional) and she said she didn't want to bother w/ the filling. it certainly was easier to not do one!
I've also torted one layer of sheetcake and put filling in it and it turned out fine - use a huge flat cookie sheet to lift the layer off though - great tip!
I think the 4 in. tall sheetcake might be too much cake for some people - and I think it doubles your servings - so it depends on what the customer wants.
Good luck & HAPPY BAKING!
I bake 2 cakes & place buttercream or filling in between.
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