The cutting rule is about .5mm thick
creasing rule is thicker
the rule is just pressed into place

dont underestimate the pressure you will need to cut even one sheet of paper with a form like this

presses to do such a thing are very heavy and exert mega pressure
and are precision things

one way of doing it is to place the form on a base board then place the board that you want to cut on top and then run a roller over the board
forms are made to 0.918" high
the roller needs to run at that height over the form
you place bits of foam rubber next to the blade to push the cut edges away from the blade

I think your idea of 2 boards with screws is possible for such a simple form but very slow...how many cuts do you want to make?