From their website:
This line consists of hallways, rooms and detail accessories. These modular pieces allow you to create a new ship interior every time you play a game. The interior walls are blank, allowing you to decorate them to your liking. For a little help decorating the walls GameCraft are offering several optional detail kits, these kits include loads of tiles that you can attach to your interior walls to customize your ship's walls. the kits are made from precision laser cut and laser engraved 1/8" (3mm) durable MDF so they will last for years and years of gaming.
Start building your dream spaceship or starbase today!
The interior modules are available in two sizes:
Small Scale versions are suitable for 15mm-20mm gaming with hallways that are 2" wide (50mm) and walls are 1.5" tall (38mm).
Large Scale versions are suitable for 25mm-30mm gaming have hallways that are 3" (76mm) wide and walls that are 2.25" (57mm) tall.