-Thinking long term, is this something I could scale to make my primary source of income?

Getting creative about using your primary as a chess piece for your investment journey is just fun and probably the best way to hit the fast forward button on your investment journey (so long as your reserves and marriage are strong enough to handle it).Honestly very smart way to play out using your main property as a source of income.

Is there any source or tool to calculate those expenses?

You are filing jointly, so only one spouse needs to qualify as a real estate professional to offset income from income sources such as your W-2.

Go to the source and I bet you get the answer quickly. 

Also, institutional lenders are going to want to "source" the down payment funds and they typically won't allow borrowed funds.

hello Nicholas thank you for taking the time to read my little blog and responding, I am not quite sure what house hack is would you be able to describe it more to me and any sources I could use to look more into that ?

I sourced, put together, and ran the deal.

A very good source of local analysis is rereport.com

If you borrowed the $600 from your shady source then sold your old property and got a new loan to pay them back.