Cool! I didn't notice the shape at first. Given all the variations over the years you could spend a lifetime just on cabinets if you wanted to. You've done some serious research just to know you have examples of all of them.
I like the old cabinets and prefer to sew at cabinet mounted machines. They also seem to come my way more often than portable machines. Problem is I have room for 3 cabinets in the house-the living room is small anyway- and it's filled now. If I add more cabinets I have to find homes for my existing machines. The only cabinet I'm interested in getting is the Deco styled Singer desk with the rounded off drawer fronts or door. Sorry, no pic to show what I mean. I saw a free one along with a couple other cabinets listed on Craig's list in Yakima a couple weeks ago. They were sitting at the curb. Yakima is 3 hrs away and there's always the chance it would have been gone before I got there. If they were closer to home I would have made the drive.
Rodney