Doesn't a lack of rental license render any lease void?  

Since THAT involves some kind of maneuvers that look too much like money-laundering (generating fake invoices that plastiq 'needs' to see, for services not really rendered, etc), I'm not doing that.  

The 3-D scans are quickly turned into renderings.

Renter's insurance ensures that if something happens to the unit that renders it uninhabitable that they have a policy in place to provide financial relief for relocating.

I looked at the website and I saw these beautiful renderings.

Financing deals through your LLC will be more expensive.And, as soon as you mess up one transaction or one signature block, you very well could have just "pierced the corporate veil" and rendered all these LLCs meaningless, depending on how it was pierced.At the end of the day, this is not a matter for BiggerPockets.  

I paid Neighbor for a service which was not rendered.

It's added together, however it doesn't matter anyway, because there is no tax and no reporting on your LLC, except for the ownership report known as PIR - Public Information Report  What about the county render tax that all the counties have?

My concerns here is that you pay the 7,800 for the training and then you are not able to gain administrative access rendering Alex's system useless.   

Just as encountering a faulty vehicle does not render all cars unreliable, the saturation of the 500 ft2 studio and 1-bedroom market in Tulum does not diminish the investment potential of other segments within the region. 3 bedroom + properties are still yielding solid returns (double digits).