A master builder has to know and understand a lot more than how to assemble a pretty looking model. To be considered a master he has to understand the principles of flight. The difference in how a model plane flys compared to a full scale and why. He must nderstand incidence, dihedral, engine thrust, airfoils, MAC, CG, radio systems, control linkage concepts, engines, prop theory and on and on, to long a list to post like this. Sorry to differ with mode 1 but if one is a master builder he KNOWS he his. The problem is there are to many that claims the level of expertise he does not possess. A couple of ones pointed to in previous post here would certianly rank right up there.