My recommendation is to get a side gig or second job, and start putting pre-paying the mortgage by rounding up then re-casting every 18-30 months with some more size.

That's a better sample size. 

.), are there any particular upsides or downsides of purchasing all single bedroom units vs. a more traditional mix of units for a property that size? 

The Austin metro market is approaching that territory.Here are the full stats for Austin and the greater metro:Here’s a chart showing the median sales price of a single-family home in the City of Austin this year through October:The median sales price for a single-family home in October 2024 was up roughly 5.5% from the beginning of the year.

I can then take those figures and estimate for future deals based on size, room and bathroom count, etc. 

For loan balances under $200k, you are better off going DSCR with a 5 year prepayment penalty and paying 2 total points on the loan (1 point is 1% of the loan size).

Force yourself to be as concise as possible and to limit the size of the pitch deck, investors will appreciate this and will likely view you as more credible if you include all of the key data i.e.

Finding a viable deal requires flexibility in location, property size, and type.

Little bit of framing and some drywall work to make a closet in a room if it has the size to do it. 

For context the comps are roughly the same sqft, 200sqft give or take, same beds/bath, same lot size, same year built.To help, here are my numbers.