Subnautica Multi-purpose Room Recipe
I hope you find Floating Island and find your desired module. Now if you need to create that module, it has a formula. 6 Titanium and Habitat Builder is required. I think you must know how to make Titanium.
At last, I will tell you if you read this guide I hope you do not doubt Multipurpose Room. This room is located on the floating island so go there and scan subnautica multi-purpose room.