Marc,
The Johnex is a very nice car and I drove a few of them that HOC had and I found them to be quite pleasant and well behaved vehicles. You purchased a nice piece.
However, I did not know that they built a DeDion rear suspension. I would like to see photos of this if you have any. I looked in your gallery and what is shown is a beam axle. (I do not remember what the linkage type is called. Maybe someone here will know.)
This is an example of a DeDion rear suspension.
I really would like to see details of a DeDion rear suspension in a Cobra. So if you have photos, please share them.