So, perhaps hiring a couple day laborers to help them move or even paying the 1st months rent on a storage unit would be better.

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

And hopefullt you won't need a traffic light, which costs in excess of $100,000, though you will be required to do a traffic study. 

For a land cost of $150k, how would you think about how much the completed home would need to sell for to make that land cost worth it?

Does the cost per sqft account for electric and plumbing? 

Materials will be about the same, but labor may vary greatly on location.

Yearly increasing costs will, in time, eat up any profit they have per unit.

all materials, all labor costs to others, Not you, utilities, interest payments, permits, licenses, auto/truck expenses, tools needed are all deductable. 

Our analysis is ARV - Rehab estimate - Finance Costs - Holding Costs = Profit.  

Cash flow is definitely the biggest challenge; both in terms of finding properties to buy that cash flow with a loan on them and just company wide given interest rates and labor/material is up and, at least where I'm at in Jackson County, MO, taxes are way up too.