About whether Gundam can be manufactured. ...

No one knows what will happen in the future, but if it develops according to the present situation and there is no discovery that completely changes the way of war, large humanoid robots will be impossible. In modern warfare, the development direction is over-the-horizon warfare, and large humanoid robots are the targets under radar. If you say it will create gundam, then you don't understand gundam. What is the premise of mobile suit's existence in the original work? Mobile suit is of strategic value because the Minovsky particle makes the radar ineffective. In reality, it is impossible to have mobile suit without this level of new discoveries. It is still possible to have a small humanoid robot, but it will not be used as a weapon in a frontal war. Different structures will be used in different situations. The weapons of frontal warfare will not be humanoid, and those MA in Gundam are still somewhat possible. So the existence of mobile suit is only possible, not big. Don't expect an invention to make mobile armor strategic.