600 half square triangles...check!

I completed the 600 half square triangles for Bonnie Hunter's Mystery quilt.  Whew!  I am particular on how I do them and made them bigger and squared each one up.  This took days!  Good thing I am not working this week.  Her next step comes out tomorrow (Friday).

Here is what I have done so far:
Step 1: 172 2" strip sections.  DONE
Step 2: 30 sets of 4  3 1/2" half square triangles = 120 half square triangles.  DONE
Step 3: 60 paper pieced strip blocks...only one done. :o(
Step 4: 30 sets of 4 2" "twosies" + 60 extra squares. DONE
Step 5: 600 2" half square triangles.  + 30 2" squares. DONE
Step 6: ?

Need to work on step 3.  Have strips...just need to sew.