Lobster rolls and Lobster Ceviche. 

You can roll the 403b’s into a self directed Ira or solo 401k if you qualify.

Some of the features I am looking for (most likely there is not 1 single vendor who has all this built-in, but more of a technology stack that integrates nicely)Would something like propstream, carrot, and kixie be powerful enough to get rolling out the gates and still be efficient in your eyes?

I think most of those are included within the high influx of newbies that roll through who are not serious.

You could roll it into a higher cash flow deal, but it would be really important to do a lot of homework before jumping in.

After I would refinance and roll it into the next deal, like all BRRRR's work.Lets say I find a deal and the numbers run to be exactly like the situation above.

I'm not really "pitching an idea" as much as I'm wanting to scale up something that is untapped and ready to roll. 

We are rolling the dice about to sign a contract.

Depending on the built in gain and how long you've lived there, you should be able to sell your current primary tax-free and roll any gains from that into your new primary residence, that is IRC section 121.Is there a set amount of time before you can move into the rental as your primary?

AirBNB is a platform you list your STRs on.I didn't get that you want zero income like @Bill B. mentioned but it should be pretty easy to to get this rolling.