CooL. I just love sitting down with a piece of black felt and some white thread and running a strip of each pattern a machine does.
We haven't done our Bernina 930 yet, but we will.
As for the mix matched parts, I've seen that in just about every genre I've worked on. Cars, guns, trucks, bicycles, sewing machines, you name it.
Fix it dude: "Opps where'd that piece go????, aw never mind I'll just stick this one in." I'm surprised some of these guys can fix anything.
Joe