I did it!
I successfully converted an Arriflex FF2 which uses 15mm rods with 100mm offsets to instead be mounted on my 19mm rods from Red.
Yes, I know I could have gotten the baseplate, but that wouldn't work for me since nothing else I had used 15mm/100mm and I wanted to use Red's handles, side handles, battery/hdd carriage, etc.
So, I had my friend's dad cut it in two! He chopped off the 15mm rod clamps and I created an angle bracket to attach the FF2 to a Red universal mount.
Here it is! The first picture is pre-cut with the cut line in red. The second two are tonight after I finished.