The something extra is a sport plane yes, and it looks similar to an Extra but with larger control surfaces to appeal to 3d pilots... My buddy has one and it flies well... The space walker from what I heard started as a model and they blew up the plans to make a full scale plane... I just watched RC Top Gun in FL on TV (DIY channel) and Chris Chianelli interviewed a guy who told the story... I really don't know either way... But if it was a full size plane first then they lied on National TV... I'll still sleep either way... Chris Chianelli can be kind of at times but oh well he got RC on national TV I'll give him that...