Les Simonton did a nice job sharing his construction guide to making Jerk Boxes. We need more open sharing like this in order to raise the bar. Many schools and organizations have in-house carpenters and electricians, and it’s possible to save thousands of dollars while building better equipment with good documentation. You can build a double frame (read twice as thick) box set for both jerks and jumps for $480.00 (unfinished) including two surface boxes for jumps and one for bumper plates. We are talking about 16 vertical feet worth of the best boxes one can have. Also you can use deck all-weather coating and ribbing for outdoor use. If you are not happy with spending up to three times as much for the same product, hang out a real lumber yard and drop a business card.