There is running private credit and running MF and then their is portfolio mgmt.

With 10 doors, you're looking at $10k/mo in guaranteed rent from section 8.

I told her - the garage door opener is $150 at Home Depot.

I also recommend you start looking for a professional property manager, at least until you educate yourself enough to run this solo.

The garage was built to work on trucks having 14' ceilings and 2 bay doors heating cooling about 700 sqft.

What are the largest pitfalls one may run into that turn this from a 150 to 350 ordeal?

You'll need something like 125 units netting $200 per door to get there, that's about 10 million worth of multifamily in today's money, so you'll need about 3 million in down payments.

I'm in a team who does these deals and we have a team of "door knockers" who go back weekly till the auction, they file bankruptcy which only delays 3+/- months 100% chance that the lender will as that their mortgage is removed from the bankruptcy they file NOD yet again.   

Depending on the flooring specs you *might* be out of luck because a lot of LVP/laminate type flooring specifies on the install that straight runs will be no longer than X number of feet and room changes will be installed with a transition.

You can't run a credit/criminal without the social.