So, if you have never worked with tools and wood before, these may seem a little prohibitive. The basic telescope need:
- a parabolic mirror
- a secondary mirror (and support called a "spider")
- a tube (usually a concrete forming "sonotube")
- a support for the main mirror
- a focuser and eyepiece
- a box that the tube rests and spins on.
On the other hand, if you use Craigslist, you can usually find a decent used one for around $200. I would recommend that you use a scope that has at least an 8" mirror in it. They're not too heavy, and they can be found used for $200-250. Of course, exercise caution when using Craigslist, as the occasional weirdo can make your life a bit scary. Used telescopes, particularly Dobsonians, rarely have anything wrong with them (since there are so few parts), so buying used can save you time and money.
But if you are feeling adventurous......
https://stellafane.org/tm/dob/
http://www.instructables.com/id/Homemade-125-inch-Dobsonian-Telescope/
http://makezine.com/projects/build-a-backyard-dobsonian-telescope/
http://www.sfsidewalkastronomers.org/?page=building-telescopes
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