EK, Barrow and Bitspower all do a O11 distro plate. EK has front and side, DDC and D5. I have the EK DDC distro plate for my O11.
Have a look at the O11 thread in the case section to see this plate in build photos. I do like it, but I would probably go with the EK FLT res now as its effectively the same thing, minus the tube runs.