I don't think there is any copyright on those drawings. The source is never mentioned and it has been copied over and over for decades. I know the British Museum authorizes non-commercial use under CC BY-NC-SA 4.0. So I think we are good.

I forgot to mention it, actually I knew about it but never tried it because, frankly, the visuals and animation aren't very appealing. But this mod was made with a lot of passion, I can see that from the constant updates, I really appreciate that effort. It would be great if a model artist could help him with the visuals. Correction: Actually, it's been discontinued. I saw it recently dated on ModDB and got confused.

Wow, there's definitely a great story behind the game Does anyone have the trailers that were mentioned? it seems the links are no longer working

Wasn't the normal, was some random vertex on the mesh:  

@wowgetoffyourcellphone