With this - https://imgur.com/JcG3ucC
Here's my raft -
https://i.imgur.com/Lx0Pan2.jpg
When I wanted to move my water purifier, I had to break all the foundations underneath it to destroy it. You should add a method to move structures without destroying floors/foundations.
You should add a way to upgrade the health of foundations (maybe with scrap) so that they last longer against shark attacks.