One question is the resale issues anticipated and how the aluminum wiring affects desirability/marketability and value.Another question is what is the rough cost per unit (approx 1000sf) to rewire with copper wire?

Way longer than I anticipated, but I tried to answer all the questions I had prior to starting this process, which was a lot.  

Startup and ongoing expenses can both be higher than you anticipate.

Numbers sound strong.I'm sure you've already heard this but in case not I want to prepare you - This project will take you much longer than you anticipate, and it will cost you much more than you expect.

Earning interest above $600/yr could throw you into a whole new tax burden you weren't even anticipating anyway.i just saw that this won't be their primary. 

Created more cash flow than anticipated.

Your conversion and new build quotes seem spot on, don't anticipate trying to refi construction cost back out because as the other poster said the ADU appraisals are far from a science for the moment.

Those pushing for fast sell typically want to dump more problems than you anticipated on your lap.

to reach those 2005 peak levels, like the other cities have.Then again, with the inevitable interest rate rising and other macroeconomic factors that may come into play in these next few years, it is totally possible something may derail my anticipated rebounding of the discounted inventory still out there.

Is it possible to use the anticipated cash flow from the rental to help qualify for a loan?