I'm very interested in this buying method and would love to pick someone's brain on this topic.

However, I have not had stable employment for the past two years, but have worked/held internships every summer and winter since starting college (September 2012).

You lose 6 months time of cash availability (perhaps 4.5 months since it does take time to get the refinance) where you may have been able to buy 2 or 3 more properties in that same 6 month time frame using my method rather than buying with cash.With my method I pay no lending costs with my first purchase since I use loan documents already created by an attorney for another loan for which I participated. 

Are there any creative investing methods that could be utilized in this?

@Josh Braun, I like your category method.  

You mentioned building credit, that and steady verifiable employment are important if you plan on using bank financing. 

I've heard of the BRRR method.

Since each solo 401k participant can borrow up to 50% of their respective solo 401k balance not to exceed $50,000, if your husband is also self employed and has funds that he can transfer to the solo 401k, he can also borrow from the solo 401k.

Additionally, the reason we hesitate to sell is because we've got an accessory apt in basement with income stream as well as a separate office for where I work every day (self employed).

My wife and I are using the BRRRR method successfully with a pace of 1 house per month give or take for the past year.