if you go through bvm, you will get fantastic customer service, as well as some improvements available for certain skymaster jets..
Bvm has developed a number of "success packs" (part packages for structural and installation improvements).
They are available for the f-104, f-4 1:73/4, hawk, f-16, f-80, l-39 and the 2m viper.
http://www.bvmjets.com/pages/skymast...ster_index.htm