Not too say that you should do the same thing, but it depends on your goals.

Usually, you can do a cash-out refinance after construction, but it depends on the lender.

It’s going to be highly dependent on your situation, assets, etc.

I have over $200k equity in my primary and I will be taking out a HELOC to fund my first deal but looking ahead - I'm not sure how long we're going to hold on to this house so I'd like to focus on building a business line of credit that I can always depend on. 

Depending on your personal life and your other properties, during the 5 year period you could live in 3 of your properties working towards this tax reduction.

To answer your question, in my opinion, it depends on your risk tolerance.

It all depends on your real estate investing goals.

Most investment property will required 20-30% down payment, depending on the lender.

I work in Construction Project Management and have found that way more people than I think have found an avenue into RE that has been supplemental income and even a hobby for them depending upon which route they took.

I will list a few options below, but the TLDR version is I may be able to help you with the Dispo side depending on the deal structure and comps.