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a world with a big deep body of water in the corner

it works with vanilla, i think, sorry i forgot how i made this world that's why im unsure

you will spawn in the floor of the ocean, just swim up and climb to the land side to build ships more comfortably

make a port (preferably out of modded indestructible blocks especially if you like testing out torpedoes like me) to make ship building easier

another note, you might experience frame drops and annoying lag when dropping large creations in water because i think that the scrap mechanic engine isnt fully optimized to deal with water physics

i dont exactly know whether using buoyancy mods would help, but give it a try it could give you access to blocks that make floating easier