Having built several ultralight dobs of differing design, I regularly get people emailing me for "plans", which I do actually have as CAD files.
Unfortunately, every telescope will be slightly different, mainly depending on the diameter, thickness and focal length of the primary mirror, (they need to balance) so you may as well go the whole way and build something that suits your particular needs. If I did it with almost zero woodwork or metalwork skills then anyone can do it!
Smaller scopes (8-10 inches) are easier to build in some ways than big ones (16+), not to mention cheaper, so you may want to do one of those first to get some experience (I didn't -just jumped straight in with a 16 incher, then built a little 10 inch later).
The "Dobsonian Telescope" book is indispensable for the principles behind engineering a good dob, even if you do not go with the classic design as described in the manual.
As well, looking at plans without the background principles or explanation can be a bit incomprehensible!
Kits are available from Astrosystems and Dobstuff too, but that would take the fun out of it.
