I think "built it" is the operative term. Was sitting by them during DeSanto's slide presentation & heard a whispered comment of either "that's a hard way to build a viper" or "that's not the way to build a viper." You know I asked questions about that later.
Models I can understand, and those guys and the CG guys I hold in awe, but full-size mockup? Those things are something like 15' by 30' and 15' wide or so.
I don't know if it's the same one that was used in BSG:TSC (RH's trailer) or not. I believe one was used for that.