6mm clear polycarbonate, a roll of 6mm self adhesive draught exclude for a snug fit and 4 glass shelf brackets 6mm. Under the foam headrests is hardened stainless steel rollbar. Center punch then drill 4 1/8 holes in the desired positions through the headrests. Use stainless steel self tapping screws to secure the brackets. You need stainless screws to maintain the integrity of the roll bars. You could fit the same material in the triangles. Total cost of materials £20that looks pretty good for a first attempt. what equipment did you use to manufacture it? And could you use the same equipment to make something for the triangles?
ThanksThat does look good
This or similar?What's that on the headrest?