Are there any potential issues I should check in advance?

I am analyzing a potential deal where I can flip a 2 family in Massachusetts.  

Great, only one state return or possibly none if you are in a state without an income tax.But if your properties are scattered across multiple states, there are more state filings and more work.I think if you want to get valuable feedback from people who respond to your post, you want to ask how much someone pays and potentially how many properties they have.Best of luck!

Is this a potential problem or is this easily corrected? 

I cut off the second half of it so I could show how at the bottom I can track expected rents and the potential rents.

Based on a rough analysis for a project timeline, I believe the total project can be completed in 5-7 months with the team I have available if we get involved in completing the work on the project.Deal Analysis as a whole - Actual Costs may be slightly different but estimates should be fairly closePost Construction Estimated Market Value - Lot 1: $379,000  Lot 2: $307,000  Total Estimated Market Value $686,000+- $102,000 - Cost to payoff HML & Previous Builder- $154,800 - Estimated Cost to complete House #1- $170,370 - Estimated Cost to complete House #2: Includes New Well/Septic $7500, Impact Fees $2100, Permits $1000= $427,170 - Estimated Cost to Payoff HML, Complete Construction on House #1, and Construct House #2+ $686,000 - Total Future Market Value-  $20,580 - 3% Buyer Agent commissions as the current owner(Listing Agent) will be listing these properties without compensation-  $2,538 - Real Estate Transfer Taxes-  $1,500 - Settlement Costs Paid at Closing______________________________________________   $234,212-  $27,900 - Payment to Seller for Down Payment made by seller to HML @ Origination (For her to break even)= $206,312 - Potential Return before any Interest/Fees/Taxes/EtcI've spoken to a few HM Lenders and ran rough numbers by them. 

We feel confident in our abilities to make it work, but looking for input about potential pitfalls, codes, etc. 

I am running some numbers on potentially cash-out refinancing a rental house.

And if it is all business, then you should have an LLC credit card that is used for fuel, tires, oil changes, car washes, etc.At the end of the day, you need to talk to a CPA and potentially an attorney.  

While I have some initial experience, I am enthusiastic about expanding my knowledge and skills in the real estate market.I am reaching out to connect with fellow investors in the area, hoping to learn from your experiences and explore potential collaboration opportunities.