You made me feel home. It's a pity that you won't work further on this project.
How did you get it so close to the original game? What's your work flow? Have you uploaded the original level mesh to UE4 for references or are you just working with pictures?
Could you please share the source files with me? I would love to play with them in UE4... so I haven't used UE4 before. Only modified the original Gothic game. I would use them only for personal use.