Hmm... The armor stand mods I've seen are based on a Mannequin race. You might try anolyzing the mod's scripts to get an idea of how it works?
Actually, the ones I'm referring to aren't scripted poses - they're static meshes. JDFan made some very similar ones for the One Stop Armor Shop mod a while back, and if I remember right he said he made his by loading it all in Blender and applying an animation file to it. There may be other ways to do it, though, I'm not sure.