Thanks 
The textures were exported from photoscan and then used photoshop to create normal maps, I also tried xnormal to generate normal maps as well. However, the model is close to 5 million polys and retains a lot of detail at such high count. I will be adding exterior scenes and will need to reduce the poly count and work further to enhance the normal maps, I will upload more pics and a video capture once I build the rest of the location.