(we're talking about economics, there's always an other hand!)

Working for 45-minute stretches (give or take) instead of for hours on end will ultimately allow you to clear your mind, grab an occasional snack or meal, and stay energized to meet your goals.Social Media DistractionsThough it may feel like staying plugged into our social media accounts is a necessary part of our jobs, the constant alerts and updates just drain our time and energy.

Also, through normal economic cycles—I would think a stock market correction may be naturally occurring in 12-18 months so I can accept a modest returnI only have exterior pictures of the property which shows it as “fine/livable”.

With more relaxed rules from July 2018, it makes a lot more economic sense to invest into building an ADU: http://www.sanjoseca.gov/DocumentCenter/View/78534

We didn't end up needing to borrow from him but we really hit it off - he loved our numbers, energy and the work we were doing - and he kind of took us under his wing.

Markets may slow down, however, notwithstanding any significant negative changes in economic conditions, I would expect markets to pickup and home prices to go up again in spring 2019.

That being said, I do not have the time nor extra energy that I would want to be put into the proper managing of my house .

Everything is going on in the market.Charlotte has one of the most active RE markets in the US.This is an extremely broad question, but some basic economic research on RE trends for the area should paint a good picture for you.

Also, is a “stacked” or top/bottom the most economical to build? 

Write clear, understandable leases with landlord provisions that you stick to, don't be an arrogant jerk flaunting your economic success, communicate often and humbly, reserve judgment when you can.