When it comes to clones, many prefer the 501st, or the 212 Utapau troops. Me I was fascinated by the shocktrooper seen in EP3, they were the original imperors guards/ troops, they picked up roasted Anakin, they kept coruscant “safe” – somehow the red paint felt right and it was in my mind that my first clone would be a shock trooper.
If Old Rex was the first clone build, the first ORIGINAL full armored clone was the shocktrooper which was first made with an ABS kit and then once again as a 3D printed bust display.