I also scan the plans or at least parts and save in CAD DXF format. The images can be reduced or enlarged to suit, and can be reversed to allow printing a reverse image that I use to iron on to the wood to be cut out. The injet image transfers nicely and leaves no residue like contact or rubber cement sometimes does. With a DXF image, the lines do not pixilate when enlargeing the image, and stay crisp and clean. There used to be free CAD software that was given as a teaser to get people into CAD and then to sell the 3D version. I am still using a free 2000 2D version of Intellicad; you could look them up.