Tutorial how to make engine part 7

Step 1:
we will model a piston. try to draw a sketch like in the picture. most importand dimension is piston radius.
Step 2:
use cut revolve command
Step 3:
open a sketch on front plane and draw a rectangle
Step 4:
use cut extrude command and cut the body
Step 5:
open a sketch on this surface
Step 6:
draw this sketch with using mirror command
Step 7:
extrude it 40mm. then open a sketch on this surface
Step 8:
use convert entities command and select this surface
Step 9:
draw the shown sketch
Step 10:
use trim command
Step 11:
extrude 10mm and mirror it
Step 12:
open a sketch on blue surface and draw a 11mm circle center of it
Step 13:
cut the body
Step 14:
now you should use fillet command.
Step 15:
use dome command
Step 16:
piston is ready for now. follow next tutorial
it will be good if you could also share the 2D drawings