I tried out different heights of screen using perspex slotted/taped onto the uncut stanchions, when we got to the preferred height cutting and shaping the metalwork was easy, we ended up getting new glass cut professionally. I was worried about water getting in between the laminations through the top edge and applied some varnish to seal it.
Dont use the windscreen washer!
I really liked the look and its dead easy to swap back to the full screen. Its currently on a friends 7 I'll try to get some pictures if you like ?