The kicker is that on my last save, I found all three engine fragments within three minutes of first reaching the mountain island, and then had to look a long time for hull and bridge parts. Engines fragments, though, predominantly behind the Auroras engines. Bridge and Hull fragments are pretty easy - just come the Mushroom Forests. I haven't dared searching too long on the north side of the mountin Island for fear of the reaper there, but I have never seen a fragment there either. There is a particular room in the Aurora that can spawn between 0 and 3 Cyclops Engine Parts.
Gone up and down the mountains dodging Warpers and Bone sharks. You can find every single cyclops fragment at the back of the aurora. I even returned to the Aurora to make sure I hadn't missed any there. I have so far combed the eastern mushroom biome, the mountains, the jellyshroom caves, the floating islands and the western mushroom biome. But I can't for the life of me find the last one I need. I also found one engine fragment in the Aurora cargo bay, and one on the shores of the mountain island. I found the bridge and hull fragments very easily in the eastern mushroom forest biome. Last time, I built my Cyclops after looking for fragments for a while, but not too long. And when the game released now, I wiped my save and started over again. So, I bought the game a few months ago, and played it for about 25hrs back then.