2004 Century 2535 (3510 Branson equivalent), 2016 Kubota MX 5200
Here is one I built using treated plywood and some old angle iron I had lying around. It fits on the quick attach frame on my Century/Branson tractor. I originally plowed an 11 ft wide track, but I narrowed it to 10 ft to make it more maneuverable.
I can send more pics of the construction if you like and I am only about 160 miles west of you. W. Jones