I am planning on building a sort of jump box this winter to ride next season and I want it to feel like a dirt jump, but made of wood. I have everything figured out as to how i am going to make it, except for the transition. I ride bmx, and would be hitting the jump at fairly fast pace. I was thinking 7' 8 inches for the launch and a 8' 6 inches for the landing. if anybody has ever experimented with this, and knows of a more ideal transition for either the landing or the launch let me know. oh, and if you were curious, i am making the launch 5 feet tall and 4 feet wide, and a 1 foot flat top (not sure about the length due to not being sure on the transition), and the landing will be 5 feet tall, 8 feet wide, and have a 2 foot flat top (again not sure of the lenght). the entire project will cost less than 200 dollars including painting it.