rear calliper orienation

[georgenewman1]

sorry guys, i know this has been covered before but im still confused. i noked up some rear uprights in the drum orientation, then bought some adaptor plater from 3g to convert to disks. the first question is do i need to mackine down the original calliper hanger ty the thickness of the plate.
also before i finish weld the uprighs completeley are the book drawings correct as i have seen people mention callipers mounted at 45 degrees before,

cheers guys