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Very good post Boyan:applouse: Have a look a joe's log http://www.mycncuk.com/threads/4755-I-ve-built-this-machine-100-different-times-in-my-head%21%21%21 all done without special tools

There is no need to spend more hours watching videos. Here on this forum 99% of the builds are exemplary plus the guys earlier have pointed you to all the details.

Just to resume:
nema23 3nm ...

Perhaps you can find some free of charge, but I think it may be difficult. Also, DIY means that you WILL make mistakes, so that should be added to the budget.

Here is a link to a current build...