Scarebird disc conversion

To nit-pic the material their plate is made of is just silly. A floating caliper is going to line up with the rotor whether it needs to flex that plate a little or not.
If someone has stripped and ruined the threaded caliper mounting holes, the same thing has happened to spindles many times.
I can imagine a few went to a parts yard and removed calipers and mounting bolts from wrecked cars. Bent bolts will screw up the assembly . No fault of Scarebird there.