I have the replacement cases for sale on my website:
www.thequiltgal.com. I have used them with my machines and they are sturdy!
The main difference with the replacement cases and the new ones is that there is no bracket in the top to hold the foot controller. There is room under the accessory holder on the left side for the foot controller and still room for the machine.
You got a good deal because the wholesale cost of these cases is pretty steep.