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Not a stupid question at all as this is a bit of an abstract concept. We can start with the pivot bar. The point 0,0 will be where the center of the triangle will rest above. the point labeled x=65.023,y=00 is where the collimation bolt should be located and corresponds to about 65mm left of the 0,0 point. An additional 65mm to the left is where the second triangle will rest.
The triangles are measured in a similar fashion. What may be confusing is the location of the upper point and the central pivot point. When laying this out on the metal, you will measure 42mm to the left of #2 and then measure directly above that point 24mm for the central pivot. Measure in a similar fashion for point #3.
Have you tried to print from plop? As I recall, it will generate great templates so you don't need to measure at all. It will ask you to specify how much material to leave around the points (I might suggest 12mm or so) and then generate a drawing that you can then cut out and use to trace around.
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