Tutorial Creating a ship design

Hi all, I tried to change ship borders (make more space available) on human ship tier 8 (from mod that changes human ship), I changed humant8blocks.png in paint 3d, replacing some red pixels with white ones, yet I see no change in-game. How can I do this?

 

You need to delete your shipworld and let the game remake it. It doesnt update on its own otherwise.

 

I tested it with a new character, so I guess it didnt have anything to update