First you find build your first plane then press start then go to the menu and press exit then go to sandbox and press build your plane second put a hollow or a normal fuselage under the cockpit too add like five or six or seven more fuselages of your choice put a nosecone on the front and then go to the back of the airplane and then get nosecone and flip it upside down like if you were in front of yourself, you would have to go back like that and then more of your choice and then add some wings structural wings the blocks then the engines and then you are done!