Easily done Jim, A piece of caravan awning rail fixed to the top of windscreen, several fibre-glass tent rods, some string & the material of choice.
Without a surrey you will not go far & stay dry ( almost dry ) We have had some right down pours in France & kept fairly dry under our cover -- sewn up by Mo on a 50 year old sewing machine ( bought for her when she was ???? old )