hi   i have learned the difference between a good airframe builder and a bad airframe builder is  when the good airframe builder makes a mistake  and we all will no matter how long you may be buildinghe stops takes the time to correct that mistake and then move foward do not live with anything you know may be marginalthe idea is to have your planes fly for as long as is possible-  that will only happen from a good build at the start-  making the reqired improvements the first 10-12 flights-( i call it getting the bugs out  )  and then constant maintanence-  to be sure the plane and it parts are air worthy