How does an inspection work in a situation like this when an inspector obviously can't get a good visual on huge portions of the space? 

Ching was used for my ASPE General Construction Estimating class and I use it today to get a visual of the parts and pieces in construction.

I have seen a few nitpicky things, but never anything you described.Personally I would be making a call to the buyers agent, scheduling a walk through with that person and the buyer (remember the agent is working to make a sale, same as you) and visually address each item.

I find on really intense books I need to think about some of the concepts and try to visualize them. 

She's a visual database.

., to at least get a visual feel of what you like.

Your mind is going to think about them;ALL NIGHT LONG.You’ll have dreams about it.When you wake up, one of the things you’re going to do as part of your Miracle Morning is the V in SAVERS (Visualization).  

I was planning to use Tableau/QlikView to give some visual insights into my data. 

Need advice on what types of metrics to show on this data visualization that I'm creating to help find good areas to invest in.

You can take a presentation with you if they are more visual in nature.