Sorry, yes, a fourth. I plead that I was tired. : )
Here's the right side chart:
F# F D Eb
Bb B G G#
Eb E C C#
G# A F F#
Eb D B Bb
G# G E Eb
C# C A Ab
I'm told this is a former Salvation Army instrument, and they required customization. Not sure how much. I know the F2 is an artifact of that. All instruments require compromise, of course. I suppose it depends how it's going to be used. You may be thinking in terms of playing melodies and runs of low notes. I often use low notes for drones, however, in which case it's helpful to have the note on the outside where the finger holding it down doesn't get in the way of other fingers doing other things.
This is very helpful. Thanks for taking the time.
wg