I tried using a simple line box to bring the colour that is going to be on the reverse through to the front of the letter, however, I soon realised that this box was pointless and had no use in the design, it was just a distraction from the type which should be focal. I took this away so that the focus is now on the type and the reverse brings the colour. I may play around with incorporating a small hint of colour into the front in a subtle manor.
This is the final design I went with:
There were some small design decisions that I made, which are not necessarily obvious unless you have an eye for design. I have used my guides to ensure the type lines up in a coherent manor but to retain a playful element too.