The machine in the picture is a 31-15. They have mounted a motor behind it; if you look closely you can see the motor pulley. They have changed out the hand wheel, but I can't tell exactly what it is they have put in its place. The tension mechanism is new, probably a Consew tensioner. The 31-15 and one of the Consew machines (can't recall the model right now, tired) can use interchangeable parts. When I need something for my 31-15 I'll look at Consew parts - sometimes they are cheaper and definitely easier to find.
The throat on the 31-15 is 10 inches. They didn't gain much by doing this conversion other than A LOT of weight!