@Admiral Fluffy You have a GameData folder inside your GameData folder. That is a big no no right there. You then have 2 instances of KerbalKonstructs.
Take everything out of the second GameData folder and put it in the main GameData folder, then delete the second one. Then make sure you aren't doubled up on the KerbalKonstructs stuff. KSP and KK look for stuff in the proper GameData folder. You are basically hiding that stuff by having it in the secondry GameData folder.