As for valuation, I see no reasons why a Junior ADU would negatively impact additional housing unit.

House hacking a 2-4 unit property with FHA (3.5% down) or Conventional (5% down) can be a smart way to start, while DSCR loans or partnerships can help if you need alternative financing.

I am a wholesaler looking to also break into house hacking, brrrr strategy, and eventually fix and flips.I am in west TX areaWhere in Tx are you currently and what strategies do you employ? 

build to rent is great. they are an intermediary that help investors contract direct with turn key new build. they are pretty sophisticated we have sold a house so far and we are looking to sell other multifamily with them. there is a vetting process and as an intermediary they don't control construction they help vet builders and establish relationships. they have a big team. the other builder I've never heard of but unless you can see your house I wouldn't touch it. rent to retirement has a strict policy of 90 days until certificate of occupancy until they will send a deal out they are good at what they do and I'd recommend them. they have options all over the country and established relationships.

My electrician insisted in rewiring my house without ripping out the existing drywall.

You could have bought a house, or several, that would have doubled in value.

I have a 5 bedroom 2 bathroom house.

Condo or house I am open to either, as long as it can be a reliable rental. 

Option 3: Pay large down-payment on modest rent ready house. 

Great tools out there to evaluate the density of rentals, houses sold/for sale like Zillow and Redfin can give you a great perspective on these and help guide your decisions!