Looks like G62 and GT80 parts...Somebody did a lot of creative machining to get the pieces to work together....
A company in Japan, Gen Engineering, made a twin about 10 years ago using G62 parts..Same hub, 2 carbs, same mounting pattern...It was displayed at Oshkosh in the Ultralight section...There were 2 types, one backpack mount and one that was on a long pipe behind the pilot on a Rogallo wing...Both had a big guard over the prop and a spring starter..There was a rep in So Cal but my english and his Japanese didn't work out too well...
Price at that time was about $1500....I had one of the engines but let an[:@] (ex) friend use it and don't know whatever became of it..The [:@](ex) friend is in the slammer