Joe2lmaker was working on a set. He had some samples tested by other owners. I can't find his post but he had CAD drawings, etc. I PM'd him and asked him to please respond here. It might help you to see where his design led and what his results were.
+1 on Joe2lmaker on the spacers, check out his personal info and you will see them.
My solution to the mirror problem cost me $1.69 plus tax at Wally world. 2" round mirror stuck in lower outer corners of each mirror. No more blind spot and i can even see my luggage bags.
Works great, but things do look closer than the seem.