铸工

铸 = 寿 + 钅 : Julian Giant Squid (zhu) is melting longevity peach buns (寿) to use them to cast (铸) a golden harpoon (钅) in the space station's bathroom (Ø4).

工 = 二 + 丨 : Mnemonic symbol: a steel beam, since 工 looks like the cross section of a steel beam. In front of the engine ((e)ng1), Gitta Giraffe (gu) is doing some hard work: She's stacking a capacitor (二) on a dinosaur bone (丨) on a capacitor (二). She's not very successful, but then she gets the idea to use steel beams (工) as support.