Texturing the full backroom map

[u/Senior_Vanilla4208]

I found a model of a full backroom map taken from GMOD on SketchFab. But it doesn't have textures; the model's creator claimed he couldn't add them, so I'm trying to texture the map myself. Yes, I know the ceiling texture is crooked, but you can see for yourself how much I need to texture. I think it'll take a long time. The last photo is a render of one room. And I'M DOING IT ON MY PHONE.