Lol, yeah the "flying saucer" is the underwater facility, just came out bigger than I anticipated, so didn't have time to re plan it's location. I did try but kept running into the same issue where the terrain exceeded Minecraft's build limit of 256 (64 being ground/water level). So I used a map overlay and free handed it. (Except pv to harbor, that was all hand built, something anyone that dug two blocks down would have found out

)
Although, I did use a height map to get My Watson and the switchbacks and tram line, still raw but it's there.