Can You Use A Chicken Wire Or Steel Armature?

Well, yes, but only if you cover the steel in Aluminium Foil first. 

The single biggest long-term destroyer of concrete sculptures (and bridges and buildings for that matter) is rusting of encapsulated steel embedded inside the concrete. Concretes can sometimes be porous if improperly formulated and prepared. Water will then slowly migrate through them naturally over time. That water can often find the steel encapsulated inside a structure and begin rusting. As steel rusts, it gradually expands, and with a slow immense pressure, will gradually shatter some structures from the inside. 

The exception to this is either cold galvanized or stainless steel. These special steels do not rust and are safe to be embedded in a PTP sculpture