I am a contractor so use home depot on a regular basis so i am familiar with their credit system.

This is very possible, is done regularly, and is sometimes done when buying REO properties.3. 

@Jim K.Jim makes a critical point about tech, we use it regularly now for viewings (when applicants are out of province) and for decades landlords/ and tradespeople have been asking for pictures when a problem comes up,... easy enough to snap a pic/ vid when starting a project of the paint can, tile, flooring, door hardware etc and give a go/ no go as the owner.

I pay my children through my LLC with a standard, regular paycheck. 

I rehab older homes regularly I’m very familiar with your situation.Vinegar is very effective but the carpet has to be removed and floors mopped throughly.I always use oil based paint primer throughout the entire house then I repaint with my desired color.

I never do anything expecting to get time with them out of it or to be able to ask them questions, but over time many of these investors have organically become part of my ecosystem and people that I regularly text with or grab a bite to eat with when we're in the same city.

Also after being a landlord for 2 years banks will look at ~70% of your rental income as part of your regular income.

One for my first house, one for the HELOC converting into a regular mortgage, and one for the second investment property? 

I believe the other 3 units can rent for up to 2,400 each.Is this deal attainable with my current situation or am I in over my head. 

Although it's "garbage in, garbage out", as long as it is used properly, regularly, and in good faith it meets the contemporaneous records requirement for mileage.One of the lowest hanging fruits in an audit is disallowance of mileage which is not supported by contemporaneous reports, or for which the reports don't appear to be contemporaneous.