@Madfox I see you got the Decal/maps attached. Did you import the png files as images and the add a Decal to the matching groups manually in AM?
@robcat2075 I played a little more with it also. I may have (or the AI query I used ) provided the incorrect command format for the MTL file.
The correct additions to the MTL are: (although the normal map still doesn't import)
The images files (at least the diffuse and specular) show up under Images and there are Decals in the Model Object with a Stamp that you can adjust the CP's on.
After some searching, it seems that as long as the OBJ file Object has a list of "vt x.xxxxx y.yyyyy" entries (Vertex Texture index) the data is present to map an image onto it.
There are numerus problems with the imported OBJ, but that I assume is normal due to the source OBJ and its triangle layout.
Imported as a Prop with the modified MTL file also works, albeit with more issues. The well_lower group has all its normal inverted - with no way I can see to flip them on the prop. But only the roof renders with color, the middle and lower render mostly black with some white specs.