I agree with John, the design is very forgiving. I too violated pretty much everything on my first mask (reflector mask on a refractor, lines about twice as wide as they were supposed to be and even a Popsicle stick blocking the central opening!) but it worked good enough to find perfect focus in about 10 seconds.
My latest generation mask from Davids mask generator software, that should be optimized exactly for my scope only produces slightly sharper defraction lines and I am able to resolve the inner pattern next to the center. How critical is this? While it may look nicer, it makes little difference in practice as perfect focus is achieved either way.
The mask is not a scientific instrument that must be optimized to close tolerances. If you take any of the posted images of the mask on this tread, size it for your scope, cut out the pattern with left-handed kiddie scissors and your mask will work well enough to focus perfectly.
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