Can you clarify the bat handle requirements?

Sure!  There has been a correction to the statement in the Structural Event rules.  It originally said that the handle of the bat had to be at least 1/2 of the barrel diameter.  The correction is that the handle of the bat needs to be at most 1/2 of the barrel diameter. For example, if your barrel has a diameter of 3-inches, the handle of that bat must have a diameter of 1.5-inches or smaller and it must taper from 3-inches to 1.5-inches (or smaller).  Please make sure that the handle is of sufficent length for swinging the bat with two hands.