Seems like there are lots of restrictions on lot size in LV for building with ADU, so that is tricky. 

They will let you know what you can and can't do without a permit and what you are able to do yourself within the scopes of those permits.My concern is because this is a rental, if you do anything that is not to code and the tenant reports it, you will likely have some much bigger issues to deal with.Given you note this is major rehab, I tend to lean to hire most, if not all, out. 

One of the issues I have noticed is that some people think of a flip house as being the cheapest possible rehab. 

If you have the budget for repairs if you rent it out, definitely rent it out!

Before sourcing the loan I would  speak with a contractor on getting a complete scope of work done and pricing.

Welcome to BiggerPockets Jason and best of luck investing!

After quitting the RE space in 2008 as a burned out landlord with upside down properties, I rejoined the space as a curious vacant land newbie investor in early 2023.

ONLY knock on doors and ONLY within 10 days of the auction. that is when folks are getting a reality check that they must do something.

I am on the lending side of things so feel free to reach out if you ever want to talk shop and finance options that are out there. 

In my experience one of my biggest lessons learned when dealing with older properties always expect more than you initially thought.