So the front rack on my Xplorer 300 broke (was repaired with Gorilla Glue rather) when I got it then broke later. I wanted a storage box to go on the back to store the usual off road essentials (2 cycle oil, tools, gloves, tow strap, coat, beer). Just kidding on that last one. But yeah Pepsis, Red Bulls, snacks.
I could have bought a new front rack for $150 and a rear storage box for another $150. And would have if my machine wasn't 20 years old and kind of beat up.
I these out of 1/2" plywood. I had most of this stuff already laying around so most of what I had to buy was hardware related.
I installed some eye hooks for bungee cords on the front. Also serves as a light mount.
I did not weigh the rear box but my guess is around 30 lbs. Being 155 lbs, and most people weigh 200 lbs, my guess is my weight would offset the weight of the box and whatever is in it. And I settled on 8" high. 12" looked a bit odd.
I installed a lock but it's not quite functional so I'm going to have to do some more work on it. But for the most part it's finished.