During this time, I made many changes.

1. Fixed accuracy of the 747-400 (not really visible, but I can see them). These changes were mostly in the body and the wing accuracy. I also added the windows for the doors to make it more accurate. 
2. Underwing pylons: Not that hard, but I wanted to make them look good, so it took a bit of time. I made the outline of the pylon, extruded it, and then cut it so it comes to a point. Then I finished off with the fillets.
3. The hardest part was the Engines. I had to create a cross-section sketch of the engine and then revolve it. After that i created tiny sketches of the back part of the engine and then created a shell to open up the engine opening. Adjusting the engine took a lot of time (cuz my blueprints are not the best) and then I had to create the connector. I did that by creating an airfoil and then creating the vertical sketch. Finished off by sweeping it. Then I created a new component, moved the engine to the right place and then created a new connected in the same way. It was always not turning out the best so i spent a lot of time fixing all of it to make it look better. It will take me almost 2-4 hrs to finish this airplane, I will fix the shape more, add the underbody and then the livery. I put an image of how the engine was not looking that good and a video on how i made it.