I will be hiring my recently retired father as the project manager/site supervisor to manage the day-to-day action.

Quality of homes will depend on the SUPERVISOR  which is mostly LUCK ...  

Now all residences challenge the sale and board of supervisor will open the hearing in October.

You don't need to pay a high priced contractor to do this work, but you at least need one supervisor or yourself who can oversee the work and make sure big mistakes aren't made.  

I would only do this with a house nearby my workplace or own home.

Both have steady well paying jobs with good previous landlord and supervisor references but one has great (high 700s) credit and another has horrible credit (550) including a bankruptcy (not sure when) and 3 recent credit checks ping'd in August.

-The current loan officer knows that the credit is struggling; his/her supervisor knows, the market president knows, etc.

I have seen members get their deposits retained by landlords on several occasions and in two cases, landlords wanted full rent for the lease but we "Supervisors" were able to talk them off the ledge. 

Normally banks resist allowing that access, but if you press you can generally speak to them, or to their supervisor.

So don't get discouraged when you get a supervisor or commander you can't stand.