How to create custom raft like game《raft》in UE

I want make a custom boat like 《raft》,I use Easy building system and Oceanology,but i can not solve the buoyancy issue when i create foundation on a boat

I was just starting to think about this, too. I know the games “Raft”, “Desert Skies”, and “Sea of Craft” have a similar building system.

Since I was planning on an archipelago setting in my original game plan, being able to build vessels and stationary bases with the same style would be helpful for not confusing the players with multiple build systems.

That said, I also want to be able to have materials like stone and brick be to heavy to be supported by the floating foundations.