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Hi David
Hopefully it is making sense for you. I agree with Mathew, your tube will probably end up around 1500-300 (1200mm) give or take.
I think you might be confused about the 39mm illumination occurring at 1500 -585mm. The 39mm illumination should be at the focal plane, 1500mm. If there is a baffle required at 1500 - 585 then it will need an ID much larger than 39mm.
Drawing it out full scale is a good idea but the large drawing can be unwieldy and you'll need a 1500mm straight edge. The drawing can be just as accurate if you scale it sown to a more manageable size.
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