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The good news, Zeljko, is that it sounds like it is a straight newtonian design, with no lens fitted in the focusser tube in order to reduce the length of the tube by two. If so, it will be much easier to collimate.
What is the eyepiece barrel diameter? - 1.25" or 0.96". If 1.25" - plenty of good eyepieces are available. If 0.96", yes you are limited.
For the moment, you should put it all together as it is - rough up a dobsonian mount, and get it collimated and see how it performs.
Be aware that a basic 6" reflecting telescope on a dobsonian mount, of good entry level quality, sells for around $369 (Andrews Communications website). So spending lots of money getting this one working and mounted may not be the best investment?
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