Macybaby: Rules were meant to be broken.
I understand no more treadles. Any cabinet machine eats space and you're already pretty much out of room. If you absolutely MUST get rid of a machine, I'd make it the newer Davis vertical feed or a more common machine first.
Why no boat shuttles? I know you have to draw the line somewhere or it can get overwhelming but I'm sure there's a practical reason for this rule. Now you have 1 example of a boat shuttle machine in a very cool package.
1900-1930 or any time period is a great way to limit yourself to but you don't have to stay inside the lines every time.
It's not for everyone but one of the things that fascinates me about sewing machines is how many ways people came up with a way to sew. I like the oddballs and deadends from when the manufacturers were still working everything out.
Rodney