I'm sure hemmings did make a twin like that , I nearly bought one. It was over 10 years ago that i looked at them so time may have fogged the memory somewhat, but i remember the throttle/reversing lever looked a lot like that. I was particularly interested in it because it only used i channel for fwd/rev & throttle. I will have a dig through the old files & see if i still have the literature on it. Of course i could be totally mistaken , it wouldn't be the first time.
cheers Glenn