Just a WAG but I imagine if you did a graham cracker crust you’d bake that separately before adding the other ingredients. Here’s one recipe: Classic Graham Cracker Crust Recipe
I’ve made a linzer torte which used dried apricots as an ingredients (OK, I know authentic linzers have raspberries) and those, I simmered in juice until the liquid was absorbed. I’d imagine you could do something with that - perhaps you’d want to puree the fruit afterward (my recipe called for that, but it was a single fruit; your mixture might not work so well as a puree). Look for some sort of dried fruit compote recipe such as this: http://www.foodnetwork.com/food/recipes/recipe/0,1977,FOOD_9936_18849,00.html
Dang, this is starting to sound tasty. What time is dinner?
Oh, and my advice for assembly:
Prepare, bake and cool crust
Prepare and cool fruit mixture and drain any excess liquid
Prepare pudding. Add to crust. Let set. Add fruit.
Consider adding fruit at serving time instead of preassembly in case its liquid makes the pudding or the crust runny.
No, you don’t need to weight graham cracker crusts. You do that to pastry crusts because it helps prevent them from bubbling and warping while baking. Since a cracker crust doesn’t create pockets of steam like a pastry one does, you don’t need to worry about the bubbling.