Thanks Eric, I used to live in Tucson but this is excellent insight for strs in the area. 

How many hours it takes is going to depend entirely on the details of the project and how well all of the players involved (including you and your client) work together.If you're really trying to do this at scale and build "unlimited" houses, ditch the bring-your-own-materials plan and start building excellent relationships with contractors, subcontractors, and govt. building departments in the areas you want to build.

Excellent deal for the minority partners (zero cash contribution) but a low ROI even accounting for tax savings of $24k/yr on a $500k cash investment.

With a $400k budget, your choice of Phoenix is excellent as it's a thriving market.

The Phoenix art district.

I believe they´ve chosen an excellent land for this project. 

Indianapolis is an excellent market to invest in.

Credit history is excellent.  

You can find them in the events section under Zen and the Art of Real Estate Investing.

Check in with @Joseph Chiofalo they work multi family nationwide and would be an excellent initial feasibility resource.