The new sun visors are 3mm acrylic, my old wind deflectors 5mm PETG - they're also looking a little tired - what PETG provides in ease of shaping it loses in being soft and prone to marking. Excuse to rationalise things and a slight re-design.
Sticking with a basic rectangular shape 150mm wide. The acrylic ordered from Trent Plastics on eBay. A 610mm x 457mm x 3mm piece delivered pre-cut into 4 pieces 150mm x 457mm, ordered Thursday - arrived Saturday! I only need to mount hinges, the diagonal cut and a little shaping to finish them.
Smaller this time, and closer into the side of the car more like 30º rather than 45-50º angle. The bottom corner against the bodywork to hold them in the right place. Careful application of heat with an electric heat gun to form the shape.
May revise them so the top edge is horizontal rather than square to the screen angle, or the back edge more vertical? I have a couple of spare acrylic panels - for possible revisions.
Tried my hand at polishing the cut edges - Youtube said a lick with a blowtorch - it works, just need to hold your nerve. Enough flame to smooth the cut edge but not enough to melt it!
That'll do for a while - again, needs a rainy day to work out if I hit the sweet spot between looks and stopping the front tyres flinging road detritus into my face.