Here's the Photoshop mock-up again - slimmer, taller but I think I did an OK job, considering.
I was preparing the numeral on top too and the litany. I got confirmation this is the correct orientation from Nick Bayton.
I stretched the number 1 even more for the top down view, but viewing at an angle will foreshorten it. I also added the Deathwing symbol to the litany.
I did a mock-up of the track guards to try to work out what size would fit in the space available. This meant the litany could be scaled to fit 15mm wide. This is much better than the original 12mm version I started with. A 25% increase in scale really helps and the mock-up also allowed me to see that the Deathwing symbol just needed to be nudged off-centre due to the trapezium shaped light mount. It will also help me position the decals as there are points of reference on the mock-up I can use to align them.
I'll make these available as a .pdf should anyone want them