Unfortuanatly this is not possible.
The map, all textures and buildings associated with it are compressed and encrypted to stop players stealing art assets and using them in their own projects.
It is almost impossible to reverse engineer the games map and assoisated assets. The reason behind having many script editors is because mission co-ordinates and other related scripting is all unencrypted and can easily be read by notepad or any other text editing application. These programs basically give you a GUI which makes map editing much easier.
Just out of curiosity do you own or have any experience in any 3d modeling application, eg. 3d studio max, maya, xsi, blender, lightwave.
I assume your hometown is Detroit as you mentioned
here. It would be awsome to see it reconstructed.
It would be great, once you finished the project to show Ubisoft and Ubisoft Reflections. It'll show them that modding community is well and alive and may make their next pc title fully moddable with included SDK (Standard Development Kit).