@Genesis Pacheco When purchasing a multifamily with a FHA loan you also need to be familiar with FHA's "self-sufficiency test". 

Considering all that you may need to adjust some but your calculations should have sufficient wiggle room. 

Unless you have a business with employees that would require an ERISA 401(k) the Solo 401(k) version is much simpler, easier & less expensive to administer, and sufficiently robust in terms of segregating retirement and personal finances.While not entirely true in all cases, I would equate eQRP with "shiny object" marketing. 

- Searching/marketing locally and with Self-Directed IRA and LLC money, so I am thinking that 30 day Option would be sufficient to research and negotiate price and terms.4.

In addition, FHA has this tricky little thing called "self sufficiency".

Do you think that would be sufficient to pass both national and state? 

As long as there is sufficient cash flow and you maintain reserve capital, leverage can be a great tool that allows for exponential growth.

An umbrella insurance policy like @Darius Ogloza mentioned should be more than sufficient.

Your property coverage amount should be sufficient to cover the full replacement cost of the property, which usually does not equal purchase price.

One gotcha for the FHA loan program when buying a 3 to 4 family is the self sufficiency test where you take 75% of all the units (including the once you occupy) which has to be equal or greater than the PITI (principal interest taxes insurance and PMI)