I just picked up the two box sets of Celestial mechs from IWM. When I bought these, it was just with the idea of quickly and easily aquiring a number of these Celestials to paint up in one of the Shadow Division's colors. Looking more closely at the descriptions on the packages, and doing a bit of research on Sarna.net, I relaized these mechs are meant to represent the specific varients piloted by the members of the Level II - Opacus of the Opacus Venatori.
Given this discovery, I decided to paint them up as the Opacus Venatori rather than generic mechs of a random Shadow Division. Looking at CSO, the pics and reference quote says that the Opacus Venatori mechs are "charcoal, fading to white at the extremities". This is indeed the way most of the miniatures on the package covers are painted, with one exception. The Archangel piloted by Precentor Berith is instead shown as red, fading to white at the extremities. I don't have access to all the WOB refernces, but I can't find anything indicating his paint job was any different than the rest of the Opacus Venatori. I would normally assume whoever painted up the miniature used for the cover photo knew what he was doing, but I just wanted to check that this is indeed canon.
Thanks! :)