Build cost low.  

I have them tell me how long a project will take to complete, and then I add buffer days or maybe up to 2 weeks, depending on how long / complex of a project it is and potentially accounting for weather if it is outside work.

From the numbers perspective it seems like it can pencil out depending on the rehab budget. 

@David F.As Russell mentioned co-ops are probably 1/2 the price of a condo and you would also have extensive costs to set up a co-op and typically it’s my understanding the builder funds the first 1-2 years of reserves.

That's three months of mortgage and utilities, the cost of flooring, and the cost of painting.

Things to consider when buying a new build are appliances, fans, blinds, and back yard landscaping; sometimes we can get appliances included, it just depends on the situation.

This is really going to depend on the state you are looking to do business in.

Is your income considered variable in nature depending on job sites and that you do not work a set amount of hours per week?

Initially the numbers were 40k for rehab cost Lessons learned?

Note that Sec8 comes with added costs & issues due to bureaucracy and state of the HUD departments in the area.