Yes my Dad knows that Fantic. It might me a Guy from Hersbruck, that is riding the bike in the linked video - and does quite well, in my opinion.👍
As I know there are some parts left, but Im not sure if a complete drive is existing, I guess not.
My Dad wouldn't mind if you contact him direct for any questions about these 2WDs.
And if there is serious interest, he would even sell his own machine for a good offer.😉
So don't hesitate to send me a PM, then I may give yo the Email adress of my Dad.
BR Ralf