Not sure how you would go in CAD software, from my experience with different types in the past it isn't really suited for scaling armour. It might have a hard time handling all that geometry (from the armour and from the avatar to scale on), plus it'd be iffy to move, scale and rotate armour sections (my knowledge is limited to Autodesk software however). You could do it in the free software Blender, though unless you know how to UV unwrap you'd have difficulty with that, and exporting it to paper can be a pain (hence why I got Armorsmith too).