Hi Orestis,
Great to hear you want to make your own mount. The good thing about dobsonian's is that even if you don't do a great job the first time, it will still probably work OK. So don't feel too daunted, give it a go and enjoy learning about how to build something.
The cost can be pretty cheap if you use ordinary 12mm plywood. Just make sure it is well sealed with paint or polyurethane. As mental suggested you can get the pieces cut which makes the whole job very easy.
As for plans, I have a book called: 'Build Your Own telescope' by Richard Berry, it has dob plans for a 6 inch and a 10 inch scope. You could re-scale either and it would work great. If you want to have a look at the book, PM me and I'll work something out.
Good Luck and let us know how you go.
Rod.
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