I planned out what I thought would work and then went to town. I'm not going to give you step by steps exactly, but I will try and explain the best I can. Its tricky when you just roll with the dilemmas and forget photos once you get frustrated.
I used two wider shutters for my front and back sides, 4 of the smaller widths to create the top and bottom. This will be visible in the final photos. Then I had one shutter that had fallen apart and all the slats were out. So I cut it down to the width my end pieces would need to be.