I recently had an opportunity to speak with their CEO at a local real estate conference; he noted they are planning to integrate several additional features with the platform which should only improve the user experience. 

TurnoverBNB is what I plan to use for cleaners and Hospitable integrates with it, sending the cleaner(s) a message whenever a booking comes in letting them know you will need their services on XX/XX/XXXX date at XX:XX time and whether another guest is checking in after.

Can a fully integrated (Property Management, Construction Management, Brokerage) small-time investor hit the same IRR's buying distressed 10 units and under properties as someone doing a hotel development?

I think there is an integration via Zapier.

Warning to myself and my BP family – nurture your personal integrity!

Having said that, I have been able to get a feel for how they operate and their integrity.  

No integrity, bad ethics, would never want to work with them again. 

Be willing to ask lots of questions of them and when you don't know the answer to their questions have the integrity to say " I will get an answer for you."  

.$250 - $300 / sqft is what the vertically integrated builders are paying - since you're going to be hiring contractors you should budget $300 - $350 /sqft , which would cover soft costs (like permits, plans, and/or entitlements) and hard construction costs. 

I heard there are ways to integrate Quickbooks w/ Excel so they sync together.