I was wondering if anyone here can offer some guidance.

You could try talking with a lender that offers DSCR.

I would love to here from anyone who has done something similar to this, especially in the Phoenix Metro area, but even someone who has done this in another state, might be able to offer some insight.

I believe they changed the guidelines years ago on the amount of seller assist you can receive on an FHA loan, so I’d look into that with your mortgage company before making an offer, but definitely use that to your advantage when writing an offer!

What is it that you believe Killeen offers that you cannot duplicate in the DFW metroplex?

I do plumbing inspections on the way in, along with full home inspections, and sometimes we do a pre-sale home inspection on the way out before the sale and we offer that as part of the listing package.

Feel free to reach out to see what we can offer.

My bank doesn't seem to know and they are just offering that I open up a separate account.  

Her contract says nothing about set up fees or early termination; I gave a generous offer to keep $400 as a design fee, but she sent me (2) $30 deadbolts and said the Technology Fee was non-refundable.There's other, better STR management companies out there.

You can also check online resources like BiggerPockets or Roofstock, which offer general CapEx guidelines based on property type and age.These methods should help you perform a solid preliminary analysis.