As always, consult with your licensed tax professional for qualifying, tax implications and strategy.

And of course we're in agreement on consulting a tax pro.

It does take 1-2 weeks to accomplish, so does require some effort and monitoring on your part, but sounds like you are a diligent self-money manager, so should be easy for you to accomplish. 

., the 2006 or 2009 IECC — International Energy Conservation Code).Cost Considerations for a 90-unit or 112-unit Project:The actual cost of qualifying for the 45L tax credit depends on various factors, including:Energy Efficiency Compliance: The primary cost will come from ensuring that each unit meets the required energy efficiency standards, which typically involve energy modeling, certification from third-party energy raters, and potentially upgrading insulation, HVAC systems, windows, and other components of the building to meet the necessary performance levels.Energy Modeling: Typically, you'll need to pay for an energy consultant or engineer to model the building's energy performance and ensure it qualifies for the credit.

Sure, you can make a few quick trades, but the playground monitors (a.k.a. the law) might notice, and you’ll miss out on the bigger opportunities and loyal customers.So, while skipping the license might seem easier, it’s not the best way to win at the toy game in the long run.I have this talk with 10-15 people each month at our Free Meetups here in MA, NH, and ME.

I can tell from your questions that you are in a bit over your head and before you make an incorrect decision you should STRONGLY consider a consultation with someone.

Consult you insurance broker for specifics but I found this policy to be very protective and reasonably priced.With regards to an umbrella policy they are typically good to have.  

@Michael James Hamlin I'm a former tax accountant/business consultant turned fix n flipper and investor friendly agent. 

Besides putting together the best SOW using accurate/actual quotes as @Peter Mckernan and @Alan Asriants commented above, another key aspect is tracking expenses (bookkeeping) and monitoring the budget throughout the project. 

This includes monitoring the transaction, conveyancing, compensating my transaction coordinator, and dealing with both sides paperwork and timelines - not including negotiations.