I actually used a sheet of A1 white card rather than order ‘Bristol board’ and for the material I bought the cheapest white sheet from Tesco. I fitted the white card inside and glued it in, and then put the longer curved length in. Masking tap placed the material around the outside.
I bought a cheap desk lamp and placed the brightest bulb I had but as you see from this photo this is not adequate. I need to get a bulb similar to the one described in the instructions. However the first shots i took are not to shabby, i'll put them up next.