I just discovered I'm better off using cylindrical lenses myself but Edmund Optics responded to my old email.
Not only did they explain the diagram on their website but also sent me DXF 3d files and some other formats for each magnification.
So I made a template which can be printed on an A4 paper. I'm also attaching the 3d files but they are for circular cut prisms, still not a problem to edit to a square in your editor.
Print without any margins otherwise the prism on paper will end up smaller.
I know there was a template already but it didn't have all the magnifications.
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