Perhaps OT, but I got to thinking and reviewing some of my old greens. I also have a sideways Biarritz on a par 4, and in today's game, wondering if sideways doesn't make more sense than back to front?
I have also done partial Biarritz, with a 2-3 feet deep valley going 1/3-1/2 way into the green, leaving cup space all around. It sort of creates the toilet bowl /seat effect without requiring a "putt round the corner" as when a bunker is stuck in the middle of the inside curve. I think Nicklaus used to call those "collector cusps" which would suck an indifferent shot right off the green.
Things going partially across the green create a variety of shots depending on pin position, and usually look more natural than a straight shelf, valley or whatever cutting through the green, usually at about 90 degree angle.
In the end, I think it's one of those things, that while neat, really doesn't work out as well as other concepts, other than to be a conversation piece green on the course.