Okay. I finally got some pics of the Plyo Stand. I will admit I had the numbers wrong. I haven't used it in a while. The wood pieces are oak and are about 20x30 and glued together with construction glue. It also adjusts from about 25"-41". The adjustable stands I got from New York barbell.
My buddy had been looking for something as the base for the stand and saw these for about $80 and free shipping. And when I talked with my buddy the total price for everything was about $105-$110. We didn't use any grip tape because we didn't really need it. We basically used some long bolts to connect the wood with the stands and large washers to cover more surface area and stronger reinforcement.
Also I had thought about making boxes of different sizes and using inch thick mats for smaller increments, but I wanted something that was easily portable. It can be easily broken down and fitted in the trunk of a compact car (i.e. civic). I have transported it to many different places for clients and myself. Hope these help