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Turf will be fine for your afterbang mat. Just remember to make it long enough for a good rideaway. (2-300 yards)
You might want some supports in the middles. If you land towards the middle of that design, it could crack. Do you have a drop in plan? Those are the hardest parts of the projects for me to design and build.
this is kind the T idea its just buried. Its pvc cut in half to hold the rail.