Without the input from a geophysics practitioner and the details of the IP survey and details of drill data, this is way beyond my ability to comment. I know that companies hold this kind of stuff “close to the chest” but would be interested to hear their evaluation of your questions.

What do they base their conceptual model on? In plan view there is a fault mapped in, but it is not included in their conceptual cross-section.

I would imagine with the limited amount of real data they are painting with broad brushes at this point. Looking forward to the next release.