I loved this chapter so much. The timing of the picture of Senku right after he mentions manufacturing just made me think that he knows it won't be all fun and games after more people are revived. Maybe I'm looking into it too much but it's a real sullen look on his face.
Even a year for that huge ship seems like not enough. But I guess most of the manpower is from some of Tsukasa's old goons.
I didn't notice the first ghost picture of Kohaku until I saw the second one that's way more obvious. The silly humor in this series is great.