The laminates are 0.15" thick. They bend without breaking, fortunately.
I can get very consistent thicknesses from my wide-belt sander. My jointer is a little off side to side (long story). I've also heard that running very thin laminates through a planer can sometimes end in quite the destructive scene.
I'm thinking of using either some wood laminates inside the bending steel to provide a less flexible backing for the bend, or using wide ratchet straps as I've seen some people do. I hate the concept of having to rebuild that jig again.
I've seen 4" ratchet straps, but can't seem to find 6" wide ones.