I believe #2 and #3 are Ok with me. It will probably be easier and faster for you to use #2. And since most people here already know the basics of paper modeling, the Google-translated text may become understandable even if the translation is not 100% accurate. I've experienced that in other places, and one can get used to. Another great plus with #2, as you already noted, is that the project could be viewed in several languages. This is good if we consider that not all the people speaks English. Some people in non-English speaking countries may have trouble with it, and they will remain in the same obscurity as if you publish the text only in Czech. Have a nice day.