I've fitted a perspex screen on our +4 today. I've used the bolts of the seatbelts to secure it so the seats can be operated seperately. Had some trouble cutting it though. I did cut it with a jigsaw with special blade but behind the blade everything melted back together. The brackets are made of 30 x 5 mm stainless steel (I think I will paint them black) and I 've used SS bolts and washers.
Dirk
1993 Morgan +4 (Connaught Green) 2009 Mini Cooper D 2024 Mercedes GLC 1994 Ford Motorhome