I half to side with WacoNut on what constitutes a builder, it's a guy/girl that's builds a complete plane from a kit or set of plans and provides all the required other equipment needed to go fly it. An ARF is a plane that has already been built and requires some finish assembly as well as providing other equipment to install to make it air worthy, that is not building, that is assembly. Also at this point even if it is altered it is only altered not built. Given todays level of education it's easy to see why some think they are building an ARF not assembling it.

Likely rile someone up, so be it.