I'm just in the process of fitting a real carbon fibre coin tray cover and an insert for the one above.
I just bought some 2mm sheet off ebay for £10, cut with a hack saw and finished of the edges with sandpaper...took about half an hour to do. The cover and tray was broken so it's just glued in place of the lid so it doesn't open.
I'm just waiting for the glue to dry so I can remove the tape I used to hold it in position then I'll get some pics up for those interested to see it.