Is their a toolset or engine to make mods?

[thebigxer]

So I'm playing through the games and I absolutely love them but sometimes I see rooms and sections of levels that I would love to edit/make new models for.

I've poked around the folders and I know its pretty easy to edit the textures but I would love to make my own levels or even add new props to the library of existing props.

I think there is a pretty huge group of people out there who would love to mode for this game especially for an engine that offers so much and I would love to take advantage of it.

[WindexGlow]

I'm guessing the whole "penumbra modification" thing right below the "new topic" button flew right past your head.