He knows the car's blueprint?
He tried to make a car before and failed. And now he can.
He doesn't have pale-moon stones right?
And how can he make a car that can be driven.
Even if he has how could he be able to drive a car without fuel?
Or forgery can make it?
All the theories that have been told so far contradict the main characters.
All stones except 'pale-moon stones' must make material inputs.
And the main character destroys the theory
I read the next chapter. He can make a gundam !!
And it is not explained at all about the material inputs why he can make gundams.
Theory:
Then it is possible that the protagonist has built a pedal car like the ones you saw in old souls where the power of the engine is replaced by people on bicycles.
He may have stolen / borrowed his master's set of spheres.
the protagonist is getting himself into trouble because he is rebelling against the one who is the object of his wife's revenge, if he proves the master's innocence is over, they put him on the black list of people to be eliminated!
did you notice that the first of the two characters that appear in the first issue appeared: is it that they know who his wife was? I know that the character has to escape from the capital just because of his bravado he is doing now.