cindyg19-I'm glad I encouraged you to possibly try out your treadle.
QuiltE-yes, the big clunky thing is a buttonholer, one of the few accessories that I did know.
GreatStarter-buttonholer
sparkys_mom-what I came up with, from the right of the needle to the big post,(I hope you understand what I'm talking about), is 8 1/2" and roughly 5 1/2" in height from the top of the bed to the bottom of the arm.
annthreecats-yes, I do eventually plan on restoring both machine and cabinet.