Not sure of your mom's age, but while framing it would be good to determine locations / future locations for grab bars and throw a few extra studs in those spots.

That could also determine his comfort level in the area and if you'll want to start there.

This is my first time trying to determine cash flow on a new construction cabin we are considering.

You'll have to determine if the ROI at that range is sufficient. 

Before visiting the property we did our due diligence by looking for comparable properties on the MLS in order to understand if this was a good deal.Determining our offer price:We use the 70% rule to determine our offer price on any property.

I want to make sure I don't leave money on the table, how would I determine the list price given that it has the opportunity to generate rental income?

In the past I've just used Zillow to determine what fair rent is.

I've only ever had lender ask about the rehab costs as a technicality not to determine the loan amount.

The actual claim payments will be determined by the adjuster but you can estimate the reduction by dividing the ACV by the RC.  

I was prepared and determined to get one of the spots for the grant as I knew it meant free equity/closing costs.