i am about to build an entire set up.
6.5ft drop in, 9ft slope,16-18 inch kicker, 16 inch high 10" by 12' box, and i already have a 22" by 12' shotgun rail.
i will probably post a step by step "review" of what i did and how it turned out.
look for it in the Build-a-Jib cult.
probably will be done in around 2 weeks, depending on how fast i can get the HDPE for the box...