It's in a rural town so I'm also worried that demand might not be as high as in more densely populated areas.I'm planning to call local banks this week to understand financing options and contact some contractors who might be interested in building additional units. 

Quote from @Greg Kasmer: I'm curious as to your comment on getting back in when the bottom has been "somewhat defined" - Is that defined by rents stabilizing and/or increasing or another metric?

If you acquire one new property each year, you could significantly increase your wealth and potentially position yourself to qualify for larger investments, like apartment buildings or construction loans, within 10 years.I’ve worked with clients who have successfully implemented this strategy, and it has proven to be an effective path to building long-term financial freedom through real estate.Good luck with your decision!

Perhaps if your partner was a general contractor or handyman type there may be some merit there to reduce costs / increase profitability.If your partner enjoys deal sourcing, a better move might be for him to become an agent - so he could legally collect commissions from finding deals and managing properties for multiple people. 

Something that is increasingly important to those clients is being cash flow positive from day 1 and this is what we deliver.

The biggest thing to me is buying in quality areas that will increase in value over time.

Quote from @Basit Siddiqi: I personally would not buy real estate with a retirement account.There are just too many headaches that are not worth the potential increased return.Some headaches when it comes to investing in real estate with a retirement account1) LTV values are less and harder to find lenders.2) Potential to sell or partially distibute the property if you have to do a RMD(Required Minimum Distribution)3) If you run out of cash and have to make a major repair, you may be out of luck and have to sell.4) Having to potentially worry about UBTI(Unrelated Business Taxable Income)I would personally invest in stocks/bonds/notes with a retirement account.I buy deals with cash and use a ROTH SDIRA so there are no RMD's.I buy at huge discounts to retail.

How do you see this coverage increasing as he scales?

Borrower has the 3% loan in place for the duration, and 14% investor can be paid off with increased rent in say 18 months.  

My estimation was with leverage I could do about 7 homes a year and each year after it would increase.