In addition to considering what lenders opinions might be (currently Fannie and Freddie don't want to see any more than 10% of units being STRs but not sure about LTSs).

It would convert the existing structure from a 2 bed 1 bath, to a 4 bed 2.5 bath, adding an additional 2000 square feet of space.  

Alternatively, DSCR ratios may not work out due to efforts to maximize the loan amount and avoid additional cash contributions. 

@Micah Franklin Check with your local credit unions.

I didn’t sign because their aggressive desperation for me to sign up was a huge turnoff and ultimately it felt like they wanted my credit card number more than anything else (which I’m sure is the case).

I had just received a 30k down payment from another owner financed deal and I wanted to get a “second home” and get some additional rental income.

-Credit Requirements: Ask about their credit requirements to see if you're a match.

I leaned the single family residences that are to my taste can only be rented to individuals with credit ratings of 700 or more.

Using a HELOC for Down Payment-Yes, it's an option.Some investors leverage a home equity line of credit (HELOC) to use existing home equity for investment property down payments.

Assuming I could qualify financially (primary income plus FHA allowed rental income contribution from additional leased units), when I become the owner of the property, would that prevent me from using a FHA 203b to house hack a second property?