Has anyone successfully tried making this ahead of time? I'm thinking Christmas morning, but want to assemble it the day before.

I am interested in making this for a Sunday brunch, I can bake it on site but I would need to assemble earlier that morning and maybe have it sit for an hour or so before baking. Bad idea? Should I forget that idea and just try this at home sometime?

You could mix the streusel topping in one container, and the dries in another. But the wets (fruit, cinnamon, cream etc) look complicated enough to leave to day of. What you don't want is to activate the dries with any wet in advance.