In fact, more times than not they are case studies for alter ego theories that can be brought by plaintiffs attorneys.   

I had to alter my plan by renting out the updated unit almost right away, and moving into the other units while completing the rehabs.For better or worse, I decided to tackle the rehabs myself to gain some construction experience and learn as much as I could about the property.

I use Avail as a starting point and then have made alterations as needed via my laywers. 

As a layman, I just see so much alledged co-mingling and alter-ego use...

Any competent plaintiffs attorney will bring in all entites  Glenn described and argue an alter ego exists to latch onto whichever entity has the insurance or assets that are easiest to collect upon.

Then you can easily narrow down your choices and alter your considerations as needed.One good way of doing that is to visualize your situation 5,10, 15+ years in the future and what do you want that investment property to accomplish for you.

Accept the fact that your renovation is imperfect and move on to a more productive issue in life.More expensive fix: Install a plastic surround (or whatever kind of surround that makes you happy) and spend the bucks to fix the siding so that it looks like the window was never there.Most awesomest fix: Alter and/or move the header and install a 4' x 15" tempered glass transom window with a PVC frame and tile or granite trim above the point where water can reasonably enter the framing.

Altering my expected outcome on the fly, in an unknown market condition.

They could take it off the wall, which would prevent the system from starting at all, but they wouldn't be able to alter the temperatures or other settings.

Hopefully, you will learn more about investing and develop additional / alterative plans.