Step 2: Paint
The top and bottom sections are sprayed silver.
I used some simple silver spray paint from the diy store, the colour actually turned out to be pretty much spot on.
When spraying something like this, don't use newspaper, get an old corrugated card box, pop a stone in the middle, newspaper is too easily blown over, and is a pain when it lands on the project.
Most importantly, use many many thin layers, i gave these about 15 or so layers, with about a minutes drying time imbetween.
Leave them to dry.
With the middle section run a black sharpie or permanent marker around the edge, depending on the template you may also have to colour in a few extra sections due to the cut away on the top layer.