Planning to sell my property in vegas, just wanted a second opinion on if these are typical, fair costs in today's market.

Who cares about lifetime interest costs, except to the extent you can easily lower them (refinance to a lower interest rate) to increase your cashflow.

A) it controls my cost.

It's been disappointing when the fed cuts caused increases in the 5yr rate (that our dscr loans are tied to).

At this time I manage and renovate majority of all my units to keep cost low but most likely not the best use of my time although I'm skilled at it.

Given interest rate changes, property values, and lender requirements, I’m curious about:How were your acquisition and rehab costs compared to your ARV?

You should only be liable for tax on any appreciation since you inherited the rental (minus the cost of your improvements). 

Purchase properties at a discount that need renovation work to then sell at a higher price profiting at least 15%+ cash on cash returns of all in costs each deal.What is the outcome?

The overhead to start a company is low, but the cost to scale is high. 

Inherently the steps are the same as if you were purchasing with financing save potentially less closing costs and ability to close sooner (if needed).The terms of your offer (ie -contingencies, closing cost splits etc) will determine what is different.