yeah, there was a dude from Wilmington (I think) that had one that he brought to many rallies 2010-2012-ish. Jake I think his name was? I'm sure someone will chime in. It ran pretty good and kept up with group rides fine but wasn't anything earth shattering. I saw that bike at WLR, dead peds, and maybe of our rallies?
If I recall his set up was different than what you're describing. I'm pretty sure it was one rotary case intake and one cylinder intake on what I assume was a bitubo top end both shas, one vespa sha and one "normal" sha
I also saw one at a swap meet in Milan a couple years ago. dude started it up but that was all I really saw of it. Dos guys and Willie treats were there, maybe they remember it better. (edited)