@Sergio Aguinaga, One solution for the Seller liability risk I mentioned is requiring the Seller to maintain a personal liability policy equal to $2-$3 million. 

I have no real solution for the risk except maybe have some sort of monthly inspection on his work progressc) Not sure if he can get insurance with me as the named beneficiaryWhat else am I missing?

Good luck,OMNI Property ManagementOptimus Property Solutions, Property Sales & Management

However, I also see companies advertising a more "all-in-one solution", in which that single company provides all of the services and investor would need to take a distressed property into a fully-rehabbed, rented, professionally manged investment.I'm wondering what experiences you have had with these all-in-one companies?

There might be some good local people who can recommend some other solutions as well.  

The great thing about real estate is that there is no one size fits all solution and it is truly about your individual situation and goals. 

My business is helping people with selling their homes when they're in need of a creative solution. 

This is one of the solution hard money lenders provide for investors. 

@Jon Pinkerton,A couple of solutions for your rent collection I would consider:Software:  You can consider some of the landlord software that offers (typically) free rent collection. 

That is a good starting point to find the right software solution.