Nice! I have two satellites myself that are just sitting there... but they're only 24 inches... My girlfriend has an american dream costume and I though about making a smaller one for her out of on those.
Metal brackets on the back is simply metal I cut with an electric shear from a template. You could use AutoCad to get the template very precise.
The straps are just pant belts from Walmart with rivets in them. I also cut off the heads of rivets and used epoxy steel to glue them to the brackets to give the effect it was riveted.
Then I used industrial strength two-way tape from Home Depot to hold the straps to the shield (incredibly strong tape, I was surprised)