These pictures show the inside of a Vitamix 7500 base. I had it open for my project to understand motor heating. I found it fascinating, and thought some of you may be interested as well.
Top view:
Bottom view (the grey metal disk is the bottom of the cooling fan): 
Motor housing from front: 
Angled bottom view with commutator visible: 
First layer of airflow system (below motor): 
Second layer of airflow system: 
I believe Vitamix engineers chose the design elements we see here to maximize motor cooling, minimize sound, and maximize longevity. The complex airflow design presumably maximizes airflow, while trapping as much sound as possible. I also noticed layers of squishy rubber between parts. The rubber dampens vibrations, which presumably helps for both sound and longevity.
The motor cutaway photos of the 7500 are fine. And very welcome.
Your website reinforced my previous instinct to buy the 7500. I sent my container to Vitamix on a recall and it was never returned. Is this common? I bought a replacement identical container because of comments on the internet that Vitamix service is dog slow. My container was a stock 4-inch blade low boy 64 oz. container.
Did you call Vitamix customer service? In my experience, that is the best way to deal with them and they always make things right. That blade recall was over 3 years ago, so I’m not sure what they’d do if you called them now, but I wouldn’t be surprised if they send you another container.