I need to build some lightweight boxes that even though they don't weigh much are still strong enough to carry things. I was thinking some thicknessed pine to around 10 mm dovetailed for max strength for the front, back and sides. I'm not sure what I'll do for the base which will be where the most pressure will be. Would it be better to just glue the base and use nails or run a slot inside the box for a base to sit in? I'm sure others here have had to build lightweight, functional boxes. What have you done?