Hope you are doing fine. I dont know if you have seen one of this sidecars in real, but i have.
A friend has seen this movie fron the sixties about it a while ago. And has been fascinated since. But, of course they are more than rare he decited to build one without having more than the pics in the hand. It took a while, but the results were better than expected. And because the original motor was available, he took a Velocette flat-twin engine instead.
See some pics:
He not just look like a gentleman; in fact he is a real nice chap.
Hope to see you one day on the road.