It allowed me to take out a percentage of total balance with out paying it back for the purchase of my primary residence

They could be willing to do an equity share where, depending on the agreed upon amount of time and money invested from both parties, the percentage of the profits are split appropriately once the property sells.  

I did reach out to someone local in my area for help so I'm hoping they will assist me for a percentage

Best way to find local CAP rate is to talk to commercial realtor and ask them what it is, or see what other properties have sold for recently, but you would need to know their NOI. you can't assume the percentage for maintenance ( not just maintenance, utilities, taxes, water, sewer, etc to determine your NOI ) you have the numbers, as inconsistent as they seem to be, some should remain constant, those that fluctuate try to use an average.

Get them rented (possibly even offer them to the current tenants so he could upgrade those units, too).What percentage of the units are rented? 

Does anyone have a "standard percentage or rule" they use for setting aside cash for the unexpected during a flip? 

Also, your right, it would be smart to factor in a larger cap-ex, what do you typically use for a percentage?  

If you want to make 30-40% on $100 million, I would say that is highly unlikely to happen.On $50-$100k, depending on the market, you could definitely do that.The ratio of your time to the money you have can change your percentage return dramatically.

I would use the term Profit/Loss to talk about the total difference at the end of the year...Certainly your points with percentages pertaining to repairs, vacancy, and capex all hold water. 

You are going to give up a percentage of your return?