Glad you finally found the time! I was also at that spot for awhile.
As for your calibration, if you are saying that you will be mounting it off the bottom then it should be rotating inside to outside. With your cable management in the middle.
This is what my Maslow looks like from the front, I highly suggest using some form of bungee like this with a center I bolt to hold it in place.
But this is what it should look like for “bottom” attachment.
Also, I have a second Maslow that is very much like yours with the wooden bolt together that I also had issues with and @bar was very helpful in getting it to work correctly, you can read about it here.
Hope this helps!