Has your son discovered KSP[1] yet? It's got a great modding community, and would, IMHO, suit a keen 14yo perfectly. It suits a keen 37yo perfectly as well :-)

Has your son discovered KSP[1] yet? It's got a great modding community, and would, IMHO, suit a keen 14yo perfectly. It suits a keen 37yo perfectly as well :-) [1] http://kerbalspaceprogram.com/ http://kerbalspaceprogram.com/