Here is my start to the mystery
As for my construction variations - for step 1 a I layered fabric 4 on top of fabric 2, drew a line corner to corner and then stitched 1/4" from the line on both sides.
I then cut corner to corner
across the stitching lines
finally I cut along the drawn lines which gave me the pairs needed.
For step 1 b I layered fabric 1 and 5 on top of one another and stitched 1/4" around the outside edge
I then cut the two diagonals
and opened them and pressed (I've always wanted to try this method of hst's and it works great
)
Now I feel like carrying on with some more piecing, but supper needs cooking and Izzy needs a new school skirt sorting out (ie making) darn it.