I would just use their boxes for idea, but I wouldn't buy one. In their little intro they talk about how you shouldn't go anywhere else cuz all they would do is sell you prefab junk and then in their box description they tell you that they can't make your box any bigger than the 2cu. That the box is already built to.
Plus all their boxes are sealed.
So that was a good site for ideas but not to purchase. IMO