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I have the exact same specs as your drop in. What i did is i went to home depot and got a 4'x8' (1/2 in.) piece of plywood and got it cut in half so its 4x4. I then put on end on the drop in and one end on the ground so the angle changes were changed a lot. Also i put pvc on the drop in horizontally. To See all this in action check out the edit in this thread: http://newschoolers.com/web/forums/readthread/thread_id/472247/