Back to your 2 1/2 inch bin.
I used creams for the "posts" and Red's for the squares. I thought of using all the same cream, but I ran out - so now it is a lot of creams.
From the Cream - cut 48 2 1/2 x 8 1/2 inch posts.
Pick a red or 2 or 3 - cut 31 2 1/2 x 2 /12 inch squares.
Next - Sew one 2 1/2 x 8 1/2 inch post to the top ( just pick one side) of your 16 patch block. And Press the seam. I wish I could tell you which direction to press, but I didn't pay attention - I just pressed.
Sew 1 ~ 2 1/2 inch red square to the top of 30 posts. You will have one red square left - Do Not Throw this away!! Or if you are a plan ahead type quilter - sew it to the other side of one of the posts. You will end up doing this at some time - but since I don't plan to far ahead - I did it last.
Thats the end of step 2.....