This picture may look very boring, but it features my scoring boards, without them i would be so lost.
The white one is by Coppernob, I use it everyday for scoring all my cards, I think you can do all sorts of fancy things with it, but so far that is beyond me.
The wooden board is what I use for making boxes, I got it from E-bay. You do your lids using one side and bottoms with the other. When I am making a box I have to experiment a bit to get the right size for what I need it for, I make a template first, which I label and keep and then make however many boxes I need based on that template.