So, at the moment, I have a B5 with 280mm front discs and a pair of Tiguan caliper/disk/pads, 312mm with 57mm piston.

I've searched the internets for about 2 hours and couldn't find anyone that would sell a caliper adapter for my conversion, so I'm thinking asking my machinery shop to fabricate ones.

But before I would like to hear some tips about the fabrication.

Don't want no weight saving so no aluminium brackets, going for steel. Should I fabricate the thread on the bracket or use bolt/nut to tighten the caliper? Whats the minimum thickness suggested? Any website, with a tutorial on how to build theses things?