As the player progresses farther into the story of Starbound, they'll unlock additional modules on their starter ship. Other ships obtained can be upgraded in a similar manner. These additional modules provide more space on the ship for players to place objects, as well as crafting stations, containers, and furniture.
To activate ship upgrades in the current nightly test builds use the following /spawnitem shipT2
Work In Progress Designs
The remaining upgrades, Apex and Hylotl, were found in the nightly test build.