We are trying to think of all our options for a rehab loan.

A full interior rehab will be about $40,000.  

Are you looking at the maintenance/repair costs of the homes once in place, W/S/G costs. septic expense if applicable? 

Can you speak on how you source granite slabs cost effectively?

ARV and Rehab costs are where BRRRR investors tend to make mistakes the most.

Purchase price: $105,000 Cash invested: $90,000 Property needed some serious rehab, from trees roots destroying the basement walls, to plumbing, electrical, to roofing, landscape.

If so, I always recommend getting the study done prior to rehabbing.

During this renovation period would you, as the lender, want an Actual Cash Value or Full Repair Cost policy in place?

It's calculated as the ratio of your total loan amount (loan amount for purchase + loan amount for your rehab) to your total costs (purchase price + rehab budget). 95% is a good target.Avoid application and other upfront/junk fees. 

Which will also depend on the neighborhood.You want to, "rehab/maintain to the Neighborhood".Most investors go overboard on their first rehab and waste a decent amount of money.