Since you mentioned REI Hub, I worked with REI Hub in the past and they had the same connection issues but their CEO is usually good about making quick updates to create a better user experience.That being said, there is no perfect solution out there regarding bank feed connections so I'd go with one you know and ensure the accounts are linked on a weekly basis to be confident every transaction is flowing through without interruptions.

I'm sure there are many more experiences where the contractor hasn't fulfilled their scope of work and gotten away with rushing the project to meet the deadline, And, I don't want to be as naive to say that I'm that 1% who can have complete quality/operational control, but I'm confident I can establish a system and hire independent inspectors to review the contractor's work. 

If are confident you will receive a permit, then somethings to think about...#1 I would call the city rentals department directly and ask if the seller's license will remain active until the day yours becomes active.

But starting with single-family can be a great way to gain experience and confidence before tackling larger deals.If you were someone I knew personally, I would probably suggest multifamily, but it's not for everyone.

I want to be able to pull the trigger when a good deal comes a long and be confident in my investment.

They must be confident in the fact they will get a solid reference. 

Thank you  Using a LOC on your primary residence can work well for flips if the terms are favorable and you’re confident in managing projects efficiently.

For these reasons i am confident you do not need an account per unit as having that requirement would be crazy complicated (the opposite if kiss).in addition, how will anyone know that you are not following the law?  

I've been interested in real estate investment since college but I've either been without the capital or without the confidence to take the first step.

Working at an investment brokerage in Austin, I can confidently say it's a strong market for real estate investment.