There was a guy who had the prototype rocket firing one at C6. It was pretty cool i'll see if i can dig up a picture. He basically used avaiable Fett parts and painted everything that purplish blue grey color and added the firing rocket to the jetpack, and made the RF appear molded into the helmet.. Thats the only one ive seen.
I actually already have intentions on doing the action figure version that was relased..and wanted to go full action figure verison by making all the parts the way they look on the figure, meaning very little detail, and also having the jetpack and backplate vac'ed as one piece (mostly) as thats how the figure was. I havent worked out all the details, but its on the to do list for sure
Sideshow actually had a lifesize one at C7 and i took a ton of pics of it because basically i want that to be wearable lol.