For anyone interested, I now have a full set of factory overfenders and the factory retro stripe kit for the bonnet and sideskirts, and am planning to reproduce both to make them as a kit with Rota RBs (Watanabe copies) to make the plain ones look a bit purdy.
The factory stickers only come in a metallic black colour, and the most of the Neo Classic Cubes all seem to be police car blue, so it'll be fun to see what they look like.