What a charming proposal, I like it a lot! BTW, I think you could improve a bit the 3D "impossible" sensation adding a little square on the inner colour curves to make them horizontals, like I show in the sample.
@thalamic: You make me blush with your kind words and appreciation of small details, dear Master. This was a basically simple font, so I thought that kind of additions would be good. Thank you very much.