However, if you’re thinking of investing a significant amount of capital, I’d do a much more comprehensive search.        

What should the "ideal" comprehensive check list include?

There SOW would usually be - 'I want a remodel done on the kitchen and bath, and add a new bedroom on the left side of the house'...Then I would add items that only a GC would know about or notice, like needing new headers for the openings they want, the elec panel being undersized, or the roof being suspect, etc...Together we would then arrive at a comprehensive SOW.Yes, that is much better scenario.

Was able to negotiate some seller concessions based on a comprehensive property inspection and several needed repairs.

This is because the main house often includes value drivers that ADUs do not, such as larger living spaces and more comprehensive amenities.

The one to four is a very comprehensive contract that covers everything and even has room for special provisions when something out of the ordinary needs to be spelled out.When doing not so normal purchases like a sub-to, I dont use the TREC, but one that I created from several other contracts.

So you take this to another comprehension level and I think that will be a tough sell.

It’s so comprehensive that I’m compelled to give you a great answer, but there is so much to unpack that a full proper answer to every question may take longer than I have tonight.

ABA cost was about $5500 that included comprehensive operating agreements for all three and subscription to their portal.

Seems like you made a pretty comprehensive list!