Credit Karma is usually accurate for checking your FICO 8 score, but real estate and auto lenders will often check your FICO 5 score, which is similar but less forgiving of certain missed payments. 

Has new roof and all new mechanicals.

I work in auto industry but want to do something else on the side that can generate some cashflow that also combines my engineering profession with my real estate investment space.

Remind them they should report any mechanical or general property issues.

Discuss with your attorney other things that should be in the contract regarding performance marks before payment, no mechanics liens, payments by them to any of their subs, etc..

Of course, it is at these times when many folks are descending on the property, and that's often when mechanical things are tested to their max. 

One piece is a detail bay for auto work (currently used by owner, willing to stay and work out a deal or I have a friend that wants to rent it for 800 a month possibly more) there's a tavern and bar on the first floor next door and there's a bourbon speakeasy in the basement.

I also found inspectors that will perform a risk assessment on electrical, foundation, and mechanicals. 

The Dad says he wilk be getting a job as a mechanic and the mom says she will be washing dishes at a restaurant.

In terms of rehabbing the property, the workflow can range from throwing a coat of paint on a wall or two, to an entire gut of the mechanicals, windows, siding, and flooring.