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Yes. But it is better with a tendon of 14 rounds. The key is to pick the beam with large round ribs.
There is no clear limit, and if you pick out more, you will have more steel bars and a large plate thickness. It is recommended not to exceed one meter. The reinforcement has to be calculated concretely, and it is impossible to talk nonsense.
There must be a cantilevered beam, commonly known as: horse legs, there is no such structure, and 4 meters need 3 such beams, otherwise this balcony is a collapse at any time.
No way! Your structural panel is up to 70 centimeters! One meter is not load-bearing, no problem! Must add a beam!
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75 pieces, but it is recommended that you buy 76 to 77 pieces, because you are afraid that some of them will be broken during transportation, or a little worse after installation, you can use 1 or 2 pieces of cutting to improve the appearance.