(you may want to pick out several based on different lot situations)Based on your plan you should be able to get estimates, You can either go to builders with their plans and ask them their cost to build pre sq.ft. or sq.m, or you can get actual pricing based on your plan. 

Since you cannot predict what things may cost 10 years from now, its not really useful in my opinion to get too detailed trying to analyze the way you have here.

We pay them back at close.For people/teams that do something similar, I'm curious what software you use or spreadsheets you've created to: Track cash current cash flow and projected cash flow for the whole business that including fixed costs like payroll and variable costs as well.

(Approach - 2) - He says that if he is asked to pull permits, he is not responsible for any additional work that the inspector may throw (basically more money out of my pocket on the rehab costs).

To keep costs low I'd like to find someone who shares similar goals to split a Garden View or Ocean view hotel room.

And while each of these is a potentially large expense, they pale in comparison to your biggest financial risk: A judgement against you for gross negligence.  

Are there other potential ownship interests, are there potential lawsuits, re there potential municipal/state/Federal pending claims, etc. etc. etc. 

This all depends on 1) your input costs versus 2) your projected revenue for the 6 months.

But for me the complexity of getting out of an S corp plus the cost of running one just didn't make sense when I could eliminate net income so many other ways and still get the pass through from disregarded or series LLCs. 

Basically appreciation potential, and potential cash flow follows all that.