I still like it!
I'd like to ride it, as well.
It looks like the wheelbase has been stretched about 10" and a jack shaft has been added.
I would guess that he built some sort of extension off the back of the trans case to provide a pivot point about four inches aft of the original. Then a swing arm was fabbed longer to use a stock belt but with the front sprocket concentric with this pivot instead of it being ahead of the pivot, like stock. So how's he driving the jack shaft? My guess would be a short chain.