Hpl3 is in the vision.

[Mudbill]

I haven't tested the game yet, but from what I gather, to play custom stories, you must launch the game differently. There is an option to launch a mod instead of normal SOMA within Steam. Not sure if this applies to custom stories as well though. I also saw that FG included two basic example custom stories within the game so they should be available if you find them.

Oh, and just wanna mention that (@Traggey) in Penumbra the terrain actually IS just single models of .daes if I remember correctly.