To quickly evaluate a a deal where there is no asking price, I usually look at capex required, adjust the property taxes (based on comparable sales) and perhaps play around with the vacancy and reserves.Is there anything I am missing?

Do anyone in Texas a process or flowchart to payoff hard money loans (used to purchase rental properties in Dallas Texas) with traditional loans?

Not sure if you are looking for private or traditional lenders, but Lima One Capital is a private lender that does 30 yr loans on investment properties.   

The BP calculators are a great resource as well as looking at comparable rents in your area.

HELOC generally with low closing cost or no closing cost but interest rate is higher compare to cash out.

If you have not, what would make you consider switching to this model compared to a more classic rental or Airbnb?

As for comparing bids, you should start by providing the architects an RFP (Request for proposal).

Is it helpful to compare the minimum accepted bid to current list price or original list price?

Typically in my (limited compared to yours) experience most issues come up shortly after moving in.

The whole point of these type of  deals is for someone who wants to live in the 3br 2ba luxurious duplex while amortizing a larger mortgage and owning land outright vs condo association while paying less out of pocket then the comparable sq ft condo costs after assessments, etc.That top unit duplex pro-forma we figured $2750 w free parking spot.