Now my first question is, have you plotted out the numbers and timeline to acquire properties and the accumulative cash position (as in money/cash coming vs. cash you put out) based on your concept of "saving $1k-$1,500 per month, and buy a triplex, live in it, use that cash flow to buy another 2-3 properties.

Do you have it in your lease that accumulated late fees can be taken out of the security deposit? 

I was able to accumulate +15 portfolio loans in a short period.  

I would need only the initial $50k for the first house, "roll it over" for each house after, then after I refi the last house I get it all back.7 - At the end of ten years the flipper has accumulated a total cash flow higher than the holder, but would need to continue to flip or the cash flow from the profits stop.  

If your goal is to accumulate a certain amount of assets, then you reinvest 100% of your cashflow. 

There are a lot of people out there who are accumulating assets for cash flow.It is simple, but definitely not easy.  

Although we both have interest in flipping houses, we both are interested in accumulating wealth.

During the time from purchase to in service date, it's just a house you own, and all costs go to the accumulating capital asset account that you have for it.

If lots, then keep good records for contributions, draws and equity splits.Revenue:Rental IncomeOther IncomeExpenses:HOA FeesMortgage InterestProperty InsuranceProperty TaxesRepairs and MaintenanceProfessional Fees (such as accountants and lawyers)(Anything else on Schedule E that you doOther:Interest IncomeFlipping Business should include:Assets:Cash AccountsMortgage Escrow Account (if appropriate)Projects in Process (one for each project, ideally)Tools and EquipmentDeposits and Prepaid ExpensesLiabilities:Accounts PayableMortgage Payable (one for each property)Other Loans PayablePayroll Tax Liabilities (as applicable)EquitySame as aboveRevenue:Property Sales RevenueCommissions Revenue (if applicable)Cost of Goods SoldProject ExpensesExpenses:Most of your job expenses will be recorded in Projects In Process as an accumulated asset and then moved to Project Expenses when you sell the project, so there's no real need to separate out expenses such as Materials, Subcontractors, Holding Costs, Utilities, etc.  

If cashflow is not sufficient meet this amount, it is accumulated and paid out on sale.