@Aaron T.Since Roth IRA can't be converted into Solo 401k your only options are:Self-directed custodial IRAIRA owned LLC (aka Checkbook IRA)Also keep in mind that retirement accounts are designed to be invested passively, if you do so all incomes/gains would be sheltered from taxes (in your case tax-free).

I am in the process of helping out a potential investor in the design and construction of a few multi-family residential projects in Kansas City.

Whether that matters to you or not is another issue.An S Corp is designed to minimize SE taxes based on "reasonable compensation", which will vary for each and every taxpayer. 

My husband and I brought in the contractor team, managed the project, made design decisions, sourced materials, created brand partnerships, etc...

@Joshua Stein I'm getting ready to buy my first house and am in a similar situation: I want to take in a roomie but am wondering about how to design the lease.

The 1031 is specifically designed to allow you to exchange properties anywhere in the US. 

They even let me design & install the entire fire sprinkler system along with the company installing the 24/7 1st responder alarm system.

I have personally designed, managed and implemented for 20+ Fortune 500 companies.That means I know how to gather business requirements, design solutions, implement according to budget/time AND manage the client through the journey.

So i'm looking to do my first BRRR and I have been looking to get financing to do this.. actually found a lender who has a loan program designed specifically for BRRR.

You may want to look for a financial planner who has their CFP designation.