I just finished up the FX-R 3.0 into ZKW bowls and it was quite the hassle. I would definitely send it off to get completed if you aren't very confident in your abilities. The shrouds' chrome came off so I had to spray paint them, they don't clip into the retrofit so I had to epoxy them, the cutting was not easy with no cutting template and not only working within the housing, but making sure the projector was centered in the shroud.
It was one of the more frustrating DIY's I've done.
However the end result is spectacular. The cutoff is glorious, the light output coming from burnt bowls is stellar. The purple flicker is neat.
Let me know if you plan to go that route as a DIY if I can help.