The Solo 401k requires earned income from self-employment.

Passive income streams require an upfront investment and a lot of nurturing in the beginning. 

In regards to the income levels, they way it works is the City will require a document be recorded against your deed that restricts the unit to tenants that make less than the amount specified. 

While you may be able to get away with not informing the county about the change in residency status, most of the legal residence application processes in SC counties to change your assessment ratio from 6% to 4% will require you to disclose if you currently claim this status elsewhere.

Where are you finding most of your tenants, and how much time/effort is required to secure a tenant?

It's been steadily going up however, so I'm either looking for lenders who would do a HELOC once my credit score reaches the required number OR I'm also seeking private lender who would be willing to lend with a second position lien on the property for the renovation amount ($35k-$40k)I was working with a private lender but he proved to be unprofessional and not able to prepare the proper, legal documents.

What LTV is required?

A HELOC cannot be used as Reserves or assets and PITI assets are required when you buy more REI.When you look at the blended rate having a HELOC and a 2% rate again it usually causes a higher payment over a simple refinance. 

No doubt..100% equity in a cashflow plan backed by physical structures or assets is hard to beat.  

It also requires gaining a level of sophistication and knowledge that not everyone has the time, inclination or ability to do.