Put the answers together and post on Classifieds Forum.Feel free to post answers here for additional constructive feedback:)

I find single ADUs are mostly being added by people with minimal RE investment experience often without a clue as to the value that will be added by the adu addition.  

There is only a limited provision to make additional fixed-amount payments once a year. 

In addition, the company that they recommend we work with, Prime, helped me set up my companies and though I repeatedly asked them if there were any differences in how it was set up because I was a Canadian, I was told that the way they suggested I do it was the right way.

Buyers usually want to purchase on today’s value while sellers often want to use future potential of the property (“current rents are below market” or “room to build an additional property”, etc) to increase the purchase price or likelihood of a sale.

This can eat into your profits significantly. 

I don't have the 10% for the down but thinking of using a HELOC to get the money and then add it into the calculator.

If they move soon, one month vacancy would eat away any savings of a hard "no" and it's wintertime (here) where vacancy is harder to fill...I'd at least discuss with the tenant and have someone do a bid to find out what it even costs for this home.

We also require that we be added to the contractor's insurance as Additionally Insured, so we're covered if they cause damage or liability issue.3) If the property is occupied:- One of our people MUST accompany their person (and we charge for this). --- We were sued many years ago, along with the owner, because tenant claimed owner's contractor sexually assaulted them!

However, they can sometimes be higher due to the additional risk taken on by the lender.With a hard money loan, you typically make interest-only payments during the loan term.No, you wouldn't owe any more interest beyond what has already accrued if you finish the project in 3 months and pay off the hard money loan earlyIt's great that you're exploring different strategies for your real estate investments!