What are you using for the pivot(spindle) material that the dumbhead or crossbar is pivoting on? Is it metal rod or wooden? I like that it does not have legs, as it stores well and easily can be put on top of a couple of horses or ponies when in use. I will build one, almost immediately, I just need to figure a few more details. What thickness do you recommend in the bench and ramp, and frame material. It looks like 2" oak? tb