Now That is not something you see every day!

Believe it or not I have had the idea for exactly this floating around in my head for Years! I just never fount the time or a couple spare greenfield to make it happen..
Very cool that you've made it compact & based on a standard chassis. I was always worried that it would end up all very bulky.

So looks like you're using foot pedals, have you considered hand levers in the conventional ztr fashion? I know foot pedals are keeping with the Greenfield theme, but I suspect it would take some getting used to. I would possibly try a set of dampers off a Hustler, the more resistance on you're pedals the smoother you will get it.

To top it off you need to find one of the very rare 1000mm double spindle greenfield decks!

A Vanguard V Twin on the back would look and sound the part I reckon..

Cant wait to see more!