四斗星官 The Star Officers Made It
逐句解 Line by line
The Star Officers of the Four Dippers oversaw the making of it; the Twenty-Eight Lodges put their labour in.
斗 is dǒu, the Dipper — the same reading as in 觔斗, the somersault, which the sealed chapters give as jīn dǒu at all nine of their sites. The 二十八宿 are the twenty-eight lunar lodges, the constellations the Chinese sky is divided into along the moon's path. 宿 is xiù in that name.
Steeped in water time and again it will not spoil; all round it is knobbed and ridged with slabs of sinew laid on.
鋪 is pū, to spread or lay on — the sealed chapters keep this apart from the pù of a shop or a post station strictly by sense. 扢搭 is a knobbly, lumpy texture, and the whole line is about a skull built like armour plate.
"And the Tang monk, still fearing it not solid enough, put a purple-gold band on it in advance."
And there is the sting in the tail. The last item in his list of what makes his head unbreakable is the headband — the thing Guanyin gave Xuanzang to control him with, the one object in the world that can hurt him. He files it under reinforcement.
The manufacturing list is a heavenly bureaucracy in miniature: the Dipper officers supervised, the twenty-eight lunar lodges did the labour. Wukong is describing his own skull as a state project with a management tier and a workforce, which is funny and is also more or less how this book's heaven operates.
The headband line is one of the great throwaways of the novel. Every reader knows what the purple-gold band is: the torture device that brings him to his knees whenever Xuanzang recites. He mentions it here as a finishing touch on the armour, in the same breath as the star officers, and moves on. Whether that is denial or acceptance the book declines to say.