But I've been trying to justify house hacking, and without using an FHA loan (I'd rather not pay the extra insurance) I'm finding it hard to see the benefits.

Call your own insurance agent to get a quote for the building.5. 

Do I have to prepare extra money in my self directed Roth IRA for maintenance/repair/tax/insurance if I invest SDIRA into  LLC ?

Make sure you get the property taxes and insurance costs down.

Here are the numbers:Monthly Payment: $1,255.60Principle balance: $177,466.11Principle: $301.61Interest Payment: $555.52Escrow Payment: $398.47Mortgage Insurance Payment: $125.36Additional Principle I pay each month: (Roughly) $144.40, to make the monthly payment an even $1400.I was given a rough appraisal of about $275K to $290k, and I know id need to meet the 75% LTV rule, so there's probably not as much Cash out equity available as I'm hoping for, but I figure Id see what my options are.  

Owner also has property tax, insurance, and outdoor upkeep.$78k annual rent with ability to add $1500 a month for vacant space.

I got  more time from them, butI  still have to change insurance companies. 

I was told the heirship affidavit was the last thing I would need for the title company to insure the title to the property.

Mortgage payment with taxes and insurance are estimated at around $1000.

The closing costs are all one-time fees and the pre-paid/escrow items are all representative of on-going expenses like insurance, taxes, and interest.