Make the landing gear three apart In the middle.
Fill the middle of the landing gear with three black wool blocks 1 higher than the landing gear.
Make the body and leave the front open.
Make the back of the helicopter.
Use the metal fence for the back propeller.
Put glass in the font for the window.
Insert seats and steering in the helicopter.
Put the door on the side with ladder to get in.
Place cobblestone fence in the middle on the top of the helicopter.
Place stone slab on the top for the propellers.
Have fun and get experimental with it.