Hi Tyler -I've "lived" with couples twice before, once in a conventional house hack situation (I lived in one unit of the building, and they lived in another), and once as "roommates" (separate bedrooms but common kitchen/living room).Wasn't an issue at all in the former.In the latter (which, if I understand correctly, is the situation that you're considering), I had a conversation with them up front about intimacy and inclusivity in common spaces.

Using this time indoors, i started putting together a plan to finally build a SFH in a piece of land I own.I know construction loans are not that common or easy to find.Does any in BP have any experience with them?

I made an error in the mortgage tab and the new CF is $237/mo

Multis / rentals are not common, and in demand.

A lien or encumbrance your relative doesn't know about, a neighbor who thinks the fence in the backyard belongs closer to the house your buying reducing the backyard to nothing, an error in the legal description that started three owner's back. 

this will be a very common issue for the next few months.. its dial for dollars time.I would also be talking with the HML about extension and or lowering rate but keeping current. they cant foreclose so it would be in their best interest to work with you through this trough

Inspection: electric panel 100 AMP; thought was 200 and may not get insurance because of it plus issue with electric boiler; ceiling torn out in kitchen due to a leak upstairs possible piping; heat pump has error 1 not working; cast iron hook up to the city that is now obsolete.

What is most important is that you know how to tap resources when issues occur, have common sense, and know the local ordinances. 

You can estimate vacancy by what is common in your area.

As you are the person living there, I would make sure that your GC is licensed and insured, check out their previous work, and make sure you have every detail on paper so you are not surprised with change orders. your project is big, lot of room for error (Missing something you wanted or didn’t know about)/ change orders.