As long as you like your job and/or industry and could do it for the next 15 years, what you are doing would work perfect for your plan.As you gain experience, maybe you can move into more units per purchase or start to BRRRR.

Guessing the potential long term construction of a new road and housing development with no time line is scaring people away.

, The builder told me that as long as my HELOC is zero balance on closing that will be okay, but I did not ask them if it will drastically lower my credit in case they will pull again for the third time with the builder. 

So, as long as the bottom line is a positive result  (grater than zero) the deal is good?

Then what timeframe is the most vital to you, short term/mid term/long term? 

There is a lot of controversy on what bacteria and virus lives on fabrics and for how long.

After 2 Duplexes ($80,000), we left with $320,000 so we want to buy another 2 Duplexes (same price) with 25% down payment ($112,500/each) since we are not living there for long-term rental which left us with $95,000 left.

It may seem counter intuitive, but the basics of real estate mentioned above are actually MUCH more important for long term success than the knowledge of any one technique or strategy. 

Growing up in CAN I already had a head start in the rules, markets, etc, so the learning curve wasn't as long.

I view my primary as my long-term home, 3 young kids with a good school system, so this is where we are settled.