Just a couple of points about the PVC jumps, as shown, and as Reignmaker is suggesting.
The jump cups shown may be too deep for the poles. If the cups are too deep, the poles will not knock out of the cups easily enough if hit. If they are too deep, the only way to knock the poles down is to knock over the entire standard. The poles should be able to be knocked out of the cups with a firm hit, not too easily, but not too difficult.
Also, if the cups are cut straight across, beside being too deep, they will sharp pointed corners, unless they are sanded down. So, be sure to sand off any points or sharp edges, as it looks like has been done in the photos.
For safety, with any jump that has jump cups, do not have any 'empty' cups above the highest jump pole. It is just a hazard to the horse. If you have extra cups, put them below the highest poles.
I am also concerned about the safety of PVC jumps when the two standards have a fixed crossbar (as the groundline). If the fixed pole is out in front of the jump, and the horse knocks the standards over, the groundline will suddenly be flipped up underneath the horse. This can also happen if the horse stops at the jump and then attempts to walk through it, or just jumps halfway. If the pole is fixed to the standards, then it can catch the horse's hind legs and cause it to stumble or cause injury. All the poles should be separate, so they can be scattered if the horse gets tangled up in the jump. It is less dangerous that way.
