The general permit is in my practice per city and if theres a dumpster needed.   

Section 8 rentals can do very well, but you have to practice and do several of them to make it worth it.

I have a mix use building in CT. the ground floor tenant is a bar/restaurant that recently moved in. they got a $2M General liability insurance and is asking if that's enough. or if they should get an umbrella. the property is valued at around $700k, fyi. where can i read up on best practices for such a case?

What are some best practices when working through due diligence at the phase of projecting cost?  

There’s probably asset protection specialists/firms  who will side with your approach but it’s not practical and they are just  fee collectors. 

Since you're focusing on Worcester, try pulling up some local property listings and practice running the numbers on them.

Conversion rate is extremely low when you get started BUT it will give you good practice speaking with sellers who have a ton of objections.

Quote from @Benjamin Weinhart: Hey Ben, I reference my old boss because I have never seen this practiced myself.

But does anyone have real feedback about how good the insulation is or how practical these homes really are? 

None of the above works unless you take action and put it into practice.