Ghost Ship is now available as a Foundry VTT module! In addition to maps, the module includes fog of war layer, walls, and functional doors, with separate versions for sound-enabled and silent doors. The package is an Authored Package, so it can be found in the Foundry module installer (just search for "ghost ship" in the search bar).

Link to the Foundry VTT package: https://foundryvtt.com/packages/ghost-ship