So you want to build a telescope. Good. So did I.
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Optics Options
	Grind
	Buy
<p?
So you now have your optics. I got lucky and found a complete set of optics
from a Mead 4.5 inch reflector at Surplus Shed for $30. I was also able to
pick up a focuser and a couple of eyepieces too.
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The calculations
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The Tube
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I used 6 inch PVC pipe. 
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Get one end square. Check it by using a combination square to verify that
the face of the tube is perpendicular to the walls of the tube.
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Mark the diameter with one of those v-shaped center finders that go on the
rulers of the combination square. 
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Get some dividers and walk the end of the pipe to divide it into six
segments. Yes, six. This will all work out later.
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Extend the marks down the side of the tube.
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Pick a mark to start from.
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Now, locate the center for the hole for the focuser. This is typically a
mirror diameter from the end of the tube. In my case, 4.5 inches. For my
focuser, I needed a 2.25 inch hole. In my case I had to file a notch in one
side of my hole to clear the focuser rack. To do it over again, I would
probably drill a 3/8 hole at the edge of the circle, then cut the focuser
hole. Either way works.
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Install the focuser and mark the bolt holes. Drill and tap for 10-32 screws.
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On the line above and below the one you installed the focuser on, mark and
drill for the spider mounts. Do the same on the line oposite the focuser.
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Also on the line above the focuser, mark and install the finder scope (big
end to the sky!)
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