Structural, mechanical, electrical, plumbing inspections.

The PM is responsible for carrying out the mechanics of the actual management...and not liable for the results.  

I had a tenant ask to install their own clothes washer because the husband was a mechanic and they wanted something heavy duty.

Don't over complicate this and don't focus so much on the mechanics.

Trying to find a "short cut" is in a way a misnomer, and I'll exaggerate to make the point; When your car breaks down, taking it to a mechanic to fix it is not a short cut.

I know in my state a bedroom can't lead to the mechanical room.

Your survival mechanism is playing out of past fears and hurts.  

I would not want them in the house during the time I was putting in thousands of dollars of mechanicals, appliances, flooring, and such. 

In every area I've built houses, you need a licensed engineer to stamp the plans, a licensed electrician/plumber/HVAC company to pull mechanical permits and a licensed GC (unless you plan to live in the house yourself). 

Even NOW with a moderate smidge of success I would definitely still hold onto that 2010 Subaru instead of buying a new vehicle - we still have a 2009 sedan and my friends always ask why I don't sell it and get something 'sweet'...well I think it's an awesome car, it runs great, and its paid for  -  WHY THE HELL WOULD I GO RIGHT BACK INTO DEBT - especially on something mechanical like a car that will depreciate?!