I was at Nationals and shot the stage we are now discussing. The left and right targets from the front were set up so one was available longer than the other. Not equal like in the diagram. I was standing there talking with one of the RM's we were talking about the new classifiers in the match. I mentioned how I thought this one would be hard to reproduce because of all the angles and walls. He told me close is good enough. They don't expect them to be perfect.
I have set up quite a few classifiers over the years. I use a tape or two and measure stuff out. Once everything is in place I have discovered somehow we managed to miss the mark and the stage is a bit crooked. Not due to lack of effort. They way the measure from edge to edge is bad for us. Our target stands only have on stick in the center.