Tutorial how to make engine part 17

Carter-2
Step 1:
draw shown sketch on the blue surface
Step 2:
use cut extrude command .
Step 3:
use extrude command. click on 'from surfacde-face-plane' option and select he green surface. then click on direction 1 'up to surface' and select the pink surface
Step 4:
draw shown sketch on the blue surface..
Step 5:
extrude the sketch up to pink surface
Step 6:
draw shown sketch front of the body
Step 7:
make same things again
Step 8:
draw a rectangle on the blue surface
Step 9:
use cut extrude command.
please follow next tutorial