File paths for the aircraft specific ones is as follows:
C:\Users\Razor\Saved Games\DCS.openbeta\Kneeboard\AV8BNA (orwhatever aircraft you want)
You may have to create the Kneeboard folder and a folder for each aircraft you want. For Kneeboard files you want available for each aircraft, you go to the mods file that has your aircraft modules in it. Instead of the aircraft, go to each individual terrain mod and drop the folders in the terrains kneeboard folder. Create it if it doesn't exist (Normandy doesn't have one). I also deleted all the default airfield maps for Nevada and Caucasus because I found them annoying. Files you want to create need to be PNG or JPEG in a 3/4 ratio ( I use 6 inches by 8).