Each property is estimated to create about $70,000 of profit over the next 3 years.  

I'd estimate that there are less than 1,000 legitimate, or "professional" wholesalers, in the United States of America, as defined by individuals who make $100K flipping contracts, and collecting assignment fees, in any form, and who have made that amount of income more than 3 years in a row.

You can expect turnover costs, losses due to vacancies, and other expenses.

You will also need about 6 months of reserves deposited in a traditional financial institution rather than a crypto account.The next step is to find the target property and calculate the acquisition costs and costs of construction along with the after-repair value. 

That's why appraisers do the comparative approach and then secondarily the cost approach.So far, 100% of the time you don't get dollar for dollar back from what I've seen.

Cost segregation utilizes the MACRS approach.

Very few non-owner occupied property policies guarantee full replacement cost - they typically provide replacement cost up to the dwelling limit purchased. 

Honestly, I think you're estimated expenses are a bit low.

Total cost of land and size?

This lesser-known strategy could help you save money and reduce your monthly payments without the hassle and cost of refinancing.