So I believe I have installed the mod correctly, I downloaded it off of KerbalSpacePort because the mediafire link doesn't work but I am missing the cargo bays when I build Space Planes and Rockets. The way I installed it (btw I am on mac) is by going into the folder KSP_osx-1 (that is where KSP and all its data is) In that folder is GameData where I then go. In GameData is one folder called Squad, I do not, repeat, DO NOT go into that folder and simply place the folders next to said Squad folders. When I go into KSP I have all the command pods, most of the structural stuff and all the engines (I believe) but when I look in Structural for the cargo bays there are none. Have I done something wrong??