Its really good, you went really in depth with it. It was a bit quiet and hard to hear though.
Also, for the katana part, that's a bit from Matsu's story.
The base is basically him making the frame of the drone and getting an idea of where everything will go.
Throughout the story, I tried to go with a feeling of him seeming very full of himself and having a big ego, making that why he talk lower on his coworkers, even though he's new. He is means to be a bit of a self made prodigy when it comes to inventing, which is why it is only 8 days.
(Also, that drawing of Gin is really good)