So, two questions arise; 1 - can this strategy work in a NORMAL period of economic activity, and 2 - can this strategy work in a difficult economic period?   

They will draw down substantially in a rising rate environment, especially if persistent inflation detracts from landlords' ability to consistently increase rents & other income. 

One card you should never use as it is only for emergencies that arise that were unexpected from the flip.You have three days to open as many cards as you want and it will hit your credit score only once.I also learned this from a real estate seminar I attended.

If you use more of your own cash for the project, you become less versatile and flexible if a problem arises. 

Feel free to reach out if any questions arise along the way, best of luck! 

As for other issues like repairs, I typically would say you handle the smaller things and they handle the bigger issues that arise.

The problem arises when other tenants or neighbours find out he is a registered sex offender.

He then sent out his prediction newsletter to the 2500 for which he had “correctly” predicted a gain.  1250 newsletter predictions were for a rising market; the other 1250 were for a decline.  

Your current approach leaves your PL exposed to any title flaws that might arise.2.

I can only see the benefit of forming a self performing property management company if you believe you can be more effective on cost and service than the local 3rd property operators and even cost can be tricky to calculate because most focus on the management fee that's charged rather than the cost to put out fires when they do arise.