I can see liability in not providing one, but I suppose I could also some some liability in providing one but not maintaining it yearly and/or having it not function when it needs to.Any thoughts?

But when you put hard-pay debt in place on properties, then you can run into trouble if the unexpected happens - i.e. big cap-ex, falling rental rates (yes rents can go DOWN), increased vacancy (for any number of reasons, including functional obsolescence, crime, population and employment shifts etc) or other issues that affect the financial performance of the property.if you own the property outright (no leverage), then you can either ride these things out or go borrow the money to fix specific issues.

Since my strategy is to live in the ADU myself so I can rent out the larger space, I would definitely want it to be fully functional with a kitchen so I can feed myself = ).

I've done this through:1) hands on work on my properties 2) working as an accountant for construction related companies which allows me see all kinds of cost data and learn how things are done through performing my job function 3) Taking on non accounting duties at these construction companies such as labor, estimating, project management4) Taking construction classes5) Reading as many books/articles as possible6) etc I expect to get my contractor's license in the next year or so.

Also there is a search function top right, If you type in private money you should find a number of links on raising private money that you might find useful. 

The overall "feel" of the property...this is somewhat subjective, but some houses are incredibly well-designed and have great aesthetics, floorplans, and functionality...other properties are poorly-designed, lack aesthetics, have awkward floorplans and poor functionality.

Otherwise you’re going to have to use the ‘draw” function to search comparable and then do $/sf.  

With #2, I either get a bunch of PM functionality I don't need, or I utilize the PM functionality by re-entering a ton of data every month that was already provided to me by my PMs.

The buyers got a much better, more updated and functional home. 

So even if it feels premature for you, I’d start right away looking for an excellent PM, or else a partner who might fill that function for you!