It's just a resources project. These sounds are open source AND Scratch is protected by Creative Commons so as long as it isn't commercial Cyan Worlds should be OK with it. Textures apparently won't be released for a while, though. Gahreesen will be coming soon. Cathedral Beam Sounds (just turn down your volume!) Press SPACE to activate the sounds (default: Antechamber) From an Antechamber position, press A. From a Courtyard position, press C. Press 0 to stop it.
I'm sure all Uru players are familiar with the classic motor of the Protractor (Cathedral Beam) of the Great Zero.