I agree. You will be making dough, rolling, re-rolling and cutting for days, not to mention baking all those parts! Go with what's easy. All you need is white royal, and may I once again recommend the royal icing mix, for safety's sake.
Every year I do 15-20 houses, and get a bunch of people together to help decorate. I buy dozens and dozens of candies, fill aluminum half pans, and just place the pans down the center of the table. Then people can pass the pans of candy down the table, and slide the others over. It keeps things neat and organized. Although with kids, that may be a dream.
Decorations I can't live without: Necco wafers, Red Hots, M&Ms, Oreos, marshmallows, popcorn, gum, Tootsie Rolls, Pretzels.
I can't wait to hear how it goes.