What will happen when he presents his creation to the scholars?
I believe that since he has broken so many rules to make his creation, presenting his creation is not going to go well. Their reaction to the numerous amount of rules he broke is more than likely not going to be a very forgiving one judging on past experiences with people breaking the rules. Such as when our main character decided not telling anyone where he was, he was lashed as a punishment, or when the man was burned alive for saying the forbidden word. As you can see from these two example the council is not very forgiving and breaking a rule always come with a swift punishment. To add to that this new technology could be deemed evil and bad. Judging from how scared they are of the unmentionable times and the technology they had there is a good chance of this happening. In that case the scholars could want to destroy it. In the end there is a large chance that presenting his creation could go horribly wrong.
This is what the scholar will want to do with our main character's work.
Why was our main character chosen to be a street sweeper when he had the skills to become a great scholar?
I think their jobs are chosen for them not becuase the council wants to make sure that every one gets the best job for them but becuase they want to make sure that people who have the skill to do extremely well in an area are not placed in that area. This would ensure that they do not advance in technology to fast and create the problems the unmentionable times had. This would explain why our main character was chosen to be a street sweeper when he had the skills needed to become a amazing scholar.
This is the type of whip our main character was most likely lashed with.
How does the Council obtain and keep so much unquestioned control?
I wonder why the people do not question the council and why they remain in so much control. I think they remain in unquestionable control with brutal punishment as seen when our main character broke the rules and when the forbidden word was spoken. I think this becuase our main character constantly talks about how what he is doing is a sin and how he will be punished. It is clear that he is scared of the consequences and I think this is how others in the community feel. The council uses brutal punishment to create fear of breaking or defying the rules of the council therefore creating the unquestionable authority they have.