A little over winter update on BE475.
December, I had a traditional roll hoop with removable diagonal fitted. In fact the hoop itself is also removable at the request of my Dad.
The work was undertaken by Andy Robinson Race Cars, and is very well constructed, being tied in to both chassis rails. The structure is all behind the rear bulk head with the hoop passing through the rear deck. We spent quite a while getting the position and height correct so that it would pass the 5cm above helmet requirement with the seat cushion removed, whilst also fitting under the hood. In the end the hood frame had to go up a quarter of an inch, and the hood itself just presses into the hood fabric by a half inch.
I also consulted a lot of period photos and screen shots from the Cobras in the Le Mans 66 (Ford vs Ferrari) film, to get the hoop diameter right.